The Carter 152-875 Electric Fuel Pump: Complete Overview, Compatibility, Installation & Troubleshooting

The Carter P152875 (also known by part number 152-875) is a high-pressure electric fuel pump designed primarily for use in carbureted fuel systems on vehicles like the Ford Mustang II and Pinto, as well as numerous Mopar applications requiring increased fuel pressure. Its reliability, specific pressure output, direct-fit design for many original pump brackets, and compatibility with modern ethanol-blended fuels make it a top choice for replacement and performance upgrades where consistent fuel delivery is critical.

This article provides a comprehensive, practical guide to understanding, selecting, installing, maintaining, and troubleshooting the Carter 152-875 fuel pump. Whether your original pump failed, you're upgrading a tired system, or restoring a classic, knowing the specifics of this pump ensures correct operation and avoids potential engine problems related to fuel starvation or incorrect pressure.

What Exactly is the Carter 152-875 Fuel Pump?

The Carter P152875 is an electric, positive-displacement fuel pump. This means it uses an internal mechanism powered by an electric motor to actively draw fuel from the tank and push it towards the engine under pressure. Specifically:

  • Electric Design: It requires connection to the vehicle's electrical system (typically 12 volts DC) to operate. This distinguishes it from older, mechanically-driven pumps attached to the engine block.
  • Positive Displacement: Inside the pump, a diaphragm or vane mechanism creates suction and pressure cycles to move fuel. This design generates consistent pressure and flow suitable for carbureted engines.
  • High-Pressure Output: The Carter 152-875 generates approximately 4.5 to 6.5 PSI (pounds per square inch) of fuel pressure. This range is significantly higher than many standard mechanical pumps (~3-4 PSI) and is specifically intended for carbureted engines modified for performance or experiencing vapor lock issues, or vehicles originally equipped with such a pump.
  • Construction: Its robust metal housing encases the motor and pumping mechanism. The inlet and outlet ports are threaded for secure fuel line connections. A protective metal filter screen is often included on the inlet side to catch large debris before it enters the pump.
  • Ethanol Compatibility: Modern Carter pumps, including replacements for the 152-875, are built with materials resistant to corrosion and degradation caused by the ethanol commonly found in today's gasoline (E10).

Key Specifications & Technical Details

Understanding the precise specifications helps determine if this pump meets your vehicle's requirements and avoids damage caused by incorrect fuel pressure.

  • Part Number: Carter P152875 / 152-875 (Sometimes listed as PU152875).
  • Type: Electric, Positive Displacement (Vane or Roller Vane style common).
  • Operating Voltage: 12 Volts DC.
  • Fuel Pressure: Outputs between 4.5 PSI and 6.5 PSI (critical specification for carbureted engines).
  • Flow Rate: Approximately 30-35 Gallons Per Hour (GPH) at free-flow conditions (without restriction). Actual flow to the carburetor will be sufficient for engines up to moderately high performance levels within its compatible applications.
  • Inlet Port: Typically 1/8" NPT (National Pipe Thread Taper) male threads. May require a specific inlet fitting adapter depending on the vehicle's fuel line setup.
  • Outlet Port: Typically 1/8" NPT male threads. Again, adapters or specific fittings are common for connection to existing fuel lines.
  • Electrical Connection: Standard "SPDT" (Single Pole, Double Throw) blade-type automotive connector is common. Two terminals: one for power (+) and one for ground (-). Polarity must be observed.
  • Rotation: Electric fuel pumps are generally uni-directional. The Carter 152-875 is designed for fuel suction on the inlet side and pressure on the outlet side.
  • Mounting: Features bolt holes designed to mount directly into the original bracket location of the vehicle it replaces (e.g., Mustang II, Pinto, Chrysler F/J/M bodies).
  • Filter: Usually includes a large, cylindrical inlet screen filter. This is a coarse pre-filter; a finer, main fuel filter must still be installed in-line between the pump and the carburetor.
  • Fluid Compatibility: Designed for gasoline, including blends containing up to 10% Ethanol (E10). Not suitable for diesel or alcohol fuels.

Primary Vehicle Applications and Compatibility

The Carter 152-875 is primarily known as an OEM (Original Equipment Manufacturer) replacement for specific American vehicles from the 1970s utilizing carburetors and requiring higher-than-average fuel pressure due to design or vapor lock susceptibility. Crucially, it is NOT a universal pump. Installing it on an incompatible vehicle, especially one with a stock mechanical pump or designed for lower pressure (like many stock carbureted GM vehicles), can cause severe flooding and damage the carburetor.

Common Direct-Fit Applications:

  • Ford Mustang II (1974-1978): Equipped with the 2.8L V6 engine. This is one of its most well-known applications. The pump mounts on the driver's side frame rail near the fuel tank.
  • Ford Pinto (1971-1980): Specifically those models equipped with the 2.8L V6 engine.
  • Chrysler, Dodge, Plymouth Vehicles (Mid-1970s): This pump was widely used on various Mopar F-body, J-body, and M-body rear-wheel-drive models with specific engine packages. This includes popular vehicles like:
    • Dodge Aspen / Plymouth Volare (Various models, particularly with lean-burn engines prone to vapor lock)
    • Dodge Diplomat / Plymouth Gran Fury / Chrysler LeBaron / Chrysler Newport / Chrysler New Yorker (Specific years/models)
    • Dodge Magnum / Plymouth Fury (Specific models/years)
  • AMC Gremlin, Hornet, Pacer (Specific models/years): Applications with the 258ci (4.2L) inline-six engine, though sometimes other electric pumps were also used. Verification for the specific vehicle is essential.

Performance & Upgrade Applications:

  • Replacing Weak/Dead OEM Electric Pumps: Direct replacement for failed pumps on the vehicles listed above.
  • Vapor Lock Solution: Replacing an inadequate mechanical pump on other carbureted vehicles experiencing persistent vapor lock problems (where fuel boils in the lines due to heat). The Carter 152-875's higher pressure and electric location (often mounted remotely near the tank) help overcome vapor lock by pushing fuel instead of pulling it. Research appropriate wiring and pressure suitability for the specific carburetor first.
  • Carbureted Performance Upgrades: Provides the increased fuel flow and pressure needed for modified carbureted engines where higher fuel volume demand exceeds the capabilities of a stock mechanical pump or a lower-pressure electric pump. Critical: Confirm carburetor pressure requirements first! Most stock Holleys, Rochesters (Quadrajets), and Carter carburetors should not exceed 7 PSI. Using a regulator with the 152-875 is common in these retrofit scenarios.

Why the Carter 152-875 Remains a Popular Choice

Despite its niche application list, the Carter P152875 endures for several strong reasons:

  1. Specific Fitment: For its target vehicles (Mustang II, Pinto, Mopars), it is a true bolt-on, plug-in replacement, saving significant installation time and hassle compared to adapting a universal pump.
  2. Targeted Pressure: Generates the precise higher pressure (4.5-6.5 PSI) demanded by those specific OE applications and effectively combats vapor lock in retrofits on other low-pressure carbureted systems.
  3. Proven Reliability: Carter has a long-standing reputation in fuel systems. This specific pump model has a track record of durability when correctly installed and maintained.
  4. Modern Materials: Updated diaphragms and seals resist deterioration from ethanol-blended fuels (E10), ensuring longer service life.
  5. Consistent Availability: Widely stocked by auto parts retailers and online suppliers due to its continued demand for restorations and replacements on popular classic models.
  6. Cost-Effectiveness: Offers a balance of performance, durability, and ease of installation at a competitive price point, especially compared to discontinued OEM units or complex aftermarket solutions.

Step-by-Step Installation Guide for the Carter 152-875

Safety First: Working with fuel requires caution. Always work in a well-ventilated area, away from sparks or open flames. Disconnect the vehicle's negative battery terminal before starting. Have a fire extinguisher rated for flammable liquids nearby.

Tools & Materials Needed:

  • New Carter P152875 fuel pump
  • In-line fuel filter (30-40 micron) rated for carbureted pressure & ethanol
  • Appropriate fuel line (steel braided, reinforced rubber EFI-rated hose, or metal tubing)
  • Fuel line fittings/adapters (if required for your specific hose/tubing connections to pump ports)
  • Wrenches (SAE & Metric, sizes dependent on vehicle fittings)
  • Socket set & extensions
  • Screwdrivers (Flat & Phillips)
  • Wire cutters/strippers/crimpers
  • Electrical connectors (butt connectors, ring terminals, spade terminals as needed) & heat shrink tubing
  • Electrical tape
  • Wire (10-14 gauge, depending on length/amperage) if extending or replacing wiring
  • Fuel-safe thread sealant (if required for fittings)
  • Drain pan
  • Shop rags

Installation Procedure:

  1. Depressurize & Drain: If replacing an old pump, relieve any residual fuel pressure. For an existing electric pump, pulling its fuse and running the engine until it stalls is one method (if possible). Place a drain pan under the pump area.
  2. Disconnect Power: Ensure negative battery cable is disconnected.
  3. Disconnect Fuel Lines: Carefully disconnect the fuel inlet and outlet lines from the old pump. Clamp lines if possible to minimize spillage. Plug or cap the lines immediately to prevent excessive fuel loss and contamination. Remove the old pump’s inlet screen filter if present.
  4. Disconnect Electrical: Unplug the electrical connector from the old pump.
  5. Remove Old Pump: Unbolt the old pump from its mounting bracket. Inspect the bracket for damage or excessive corrosion.
  6. Prepare New Pump:
    • Inspect the new Carter 152-875 pump for damage.
    • Ensure the inlet filter screen is clean and securely attached.
    • Install any necessary adapters or fittings onto the inlet and outlet ports using a small amount of fuel-safe thread sealant on the male threads only. Do not get sealant inside the ports. Finger-tighten first.
  7. Mount New Pump: Position the new Carter pump into the vehicle's existing mounting bracket. Secure it with the provided or original mounting bolts. Tighten securely but avoid overtightening and cracking the pump housing. Orientation typically has the inlet pointing downward/toward the tank and outlet pointing upward/toward the engine.
  8. Reconnect Fuel Lines: Connect the INLET line (coming from the fuel tank) to the pump's INLET port. Connect the OUTLET line (going towards the engine) to the pump's OUTLET port. Ensure connections are tight and secure with wrenches (avoid stripping fittings). Use new hose clamps if using rubber hose sections (ensure clamps are positioned correctly).
  9. Install In-Line Filter: If not replacing an existing one, install a new in-line fuel filter after the pump outlet and before the carburetor inlet. Follow filter flow direction arrows.
  10. Reconnect Electrical: Connect the vehicle's wiring harness to the new pump's electrical connector. Verify Polarity: On a Carter 152-875, observe polarity (Power (+) to the correct terminal, Ground (-) to the other terminal). The connector usually only fits one way, but double-check wiring diagrams if unsure. Do not reverse polarity.
  11. Check Connections: Visually inspect all fuel line connections, wiring connections, and mounting bolts for tightness and security.
  12. Reconnect Battery: Reattach the negative battery terminal.
  13. Priming & Initial Test: Turn the ignition key to the "ON" position (do not start the engine) for a few seconds. Listen for the pump to run briefly (usually 1-3 seconds) to prime the system. Repeat the ON-OFF cycle 2-3 times to build pressure and purge air. Check all connections carefully for any fuel leaks. Address leaks immediately if found.
  14. Start Engine: Start the engine. It may crank slightly longer than usual. Monitor fuel pressure at the carburetor if possible (using a gauge temporarily). Listen for smooth pump operation (a consistent whine/buzz).
  15. Final Leak Check: With the engine running and off, conduct a final thorough inspection of all connections for leaks.
  16. Road Test: Drive the vehicle, paying attention to engine performance across various RPM ranges and loads. Ensure smooth acceleration and no fuel starvation symptoms.

Common Problems, Symptoms & Troubleshooting Guide for the Carter 152-875

Even a robust pump like the Carter 152-875 can experience issues. Identifying symptoms and systematically troubleshooting is key.

Common Symptoms of Failure:

  1. Engine Cranks But Won't Start: The most obvious symptom. No fuel reaches the carburetor.
  2. Engine Starts Then Stalls: Pump runs intermittently or cannot maintain pressure/flow.
  3. Loss of Power / Stumbling Under Load: Inadequate fuel delivery during higher demand (acceleration, climbing hills).
  4. Vapor Lock (Hot Start/Restart Difficulties): May indicate pump failure or insufficient performance for preventing vaporization, especially if the pump is near heat sources. Can sometimes be heard as a "cavitation" noise.
  5. Surging or Hesitation: Intermittent fuel delivery.
  6. Noticeably Louder Pump Operation: Excessive whining or screeching indicates internal wear, bearing failure, or cavitation due to blockage.
  7. Visible Fuel Leak: From pump housing, connections, or seals.

Troubleshooting Steps:

  1. Safety: Park safely, ventilate, disconnect battery negative.
  2. Listen for Pump Operation: Turn ignition to "ON" (engine off). You should clearly hear the pump run for 1-3 seconds. If you hear nothing, go to Step 4.
  3. If Pump Runs But No/Improper Fuel Flow:
    • Check Fuel Level: Ensure the gas tank is not empty.
    • Check Inlet Filter: Inspect the pump's inlet screen for severe clogging. Clean carefully or replace. Clean debris from inside inlet port.
    • Check Fuel Lines: Check for kinked, collapsed, or clogged fuel lines between the tank and pump. Blow compressed air backwards towards the tank if possible (carefully). Check for restrictions in the tank pickup sock. Consider a clogged vent causing vapor lock.
    • Check Main Fuel Filter: Replace the main in-line filter between pump and carburetor. Is it clogged?
    • Test Pressure/Flow (Requires Tools): Install a fuel pressure gauge at the carburetor inlet. Key ON: Should show steady pressure within spec (4.5-6.5 PSI) while priming. If pressure is low or zero with pump running, suspect a blockage before the pump or significant internal pump wear. If pressure builds but bleeds off rapidly when pump stops, suspect a bad check valve inside the pump. A flow test into a container (disconnect outlet line temporarily) can reveal low volume.
  4. If Pump Does NOT Run (No Sound at Key On):
    • Check Power (Fuse/Relay): Locate the fuel pump fuse in the vehicle's fuse box. Check if blown. Replace with correct amperage fuse. If fuse blows immediately, suspect a short circuit in the wiring or pump windings. Check if the vehicle has an inertia safety switch (common in Fords) and verify it hasn't tripped (usually red button on firewall/kick panel). Reset if found tripped.
    • Check Voltage at Pump Connector: Using a multimeter, disconnect the pump electrical harness connector. With key turned to "ON" (or have an assistant do it), probe the terminals in the vehicle side of the harness connector. You should read approximately battery voltage (12V+). If no voltage:
      • Trace wiring backwards: Check for corrosion, broken wires, poor connections at connectors, relays, or fuse box.
      • Locate the fuel pump relay (consult service manual). Swap it with a known-good identical relay (like horn relay) for testing. Check relay control circuit.
      • Verify ignition switch signals.
    • Check Ground: Probe from the negative terminal in the pump's harness connector to a clean chassis ground point. Should read less than 0.5 Ohms. Clean or repair ground wire/connection if resistance is high.
    • Test Pump Directly: If voltage and ground are present at the harness when key is ON, but pump doesn't run, suspect a failed pump motor. Confirm by temporarily connecting the pump directly to a known-good 12V battery source (clip leads). Observe polarity! If it runs, the problem is in the vehicle wiring/controls. If it doesn't run, the pump is faulty.
  5. Visual Inspection: Look for obvious damage to the pump housing, inlet screen, electrical connector, or signs of severe corrosion or leaking.
  6. Fuel Contamination: Severe debris or water in the fuel tank can accelerate pump wear and cause failure. Inspect the condition of fuel in the pump inlet filter and main filter.

Maintenance & Best Practices for Longevity

Maximize the life and reliability of your Carter 152-875 pump:

  1. Regular Filter Replacement: Replace the main in-line fuel filter at least annually or per your vehicle's severe service schedule. Inspect/clean the inlet screen periodically (e.g., during oil changes).
  2. Keep Gas Tank Reasonably Full: Reduces condensation (water in fuel) and keeps the pump cooler, especially in hot weather where fuel helps dissipate motor heat.
  3. Quality Fuel: Use reputable gasoline sources. While designed for E10, avoid higher ethanol blends (E15, E85) unless explicitly approved for them. Water-contaminated or extremely dirty fuel kills pumps.
  4. Avoid Running on Empty: Repeatedly running the tank very low increases the risk of sucking up sediment or causing the pump to overheat due to lack of cooling/priming fuel.
  5. Secure Mounting: Ensure the pump is securely fastened to its bracket to minimize vibration stress on components and connections. Check mounting bolts occasionally.
  6. Protect Wiring: Ensure wiring is secure, protected from heat and abrasion, and properly routed away from moving parts and exhaust components.
  7. Address Leaks Promptly: Fuel leaks are fire hazards and can indicate seal failure needing immediate attention.
  8. Don't Ignore Symptoms: If you notice performance changes, unusual pump noise, or difficult starting, investigate early. Ignoring problems can lead to complete failure or worsen related issues.

Where to Buy the Carter 152-875 Fuel Pump

Given its importance, purchase from reputable sources:

  • Major Auto Parts Chains: Advance Auto Parts, AutoZone, O'Reilly Auto Parts, NAPA Auto Parts. They often stock it or can get it quickly. Use their websites to confirm inventory. Online purchases offer convenience.
  • Online Retailers: Amazon (verify seller rating), RockAuto (offers competitive pricing and multiple brand options - ensure correct part number), Summit Racing, Jegs (good for performance parts too).
  • Carter Direct: Carter's official website or authorized distributors may offer direct purchase options.
  • Specialized Classic Parts Suppliers: Companies catering to Mustang II, Pinto, or Mopar restoration parts will reliably stock it.

Considerations When Purchasing:

  • Brand: While Carter is the OE supplier, reputable aftermarket brands like Airtex, Delphi, or Denso may also manufacture versions meeting OE specs ("OE Replacement"). Quality can vary – Carter or premium brands are often preferred for critical components.
  • Warranty: Check the warranty period offered (often 1-2 years).
  • Package Contents: Ensure the pump comes with a new inlet screen filter and gasket/isolator if applicable. Verify whether any necessary adapters are included or need purchasing separately.
  • Return Policy: Understand the return policy in case of incorrect part or defects.

Conclusion: The Carter P152875 152-875 - A Focused Solution

The Carter 152-875 electric fuel pump serves a specific but vital role. For owners of Ford Mustang IIs, Pintos with the V6, and specific mid-70s Mopar vehicles, it is the direct, high-pressure replacement needed for correct operation. Its ability to generate 4.5-6.5 PSI also makes it a valuable upgrade weapon against persistent vapor lock on other carbureted classics or mild performance builds lacking sufficient fuel pressure. Reliable, designed to handle modern ethanol fuels, and readily available, the Carter P152875 solves fuel delivery problems definitively when matched to compatible systems. Always prioritize correct vehicle application and pressure requirements, ensure professional installation and maintenance, and this pump will deliver the fuel needed reliably for miles down the road.

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