Q: 1993 Ford F150 4.9 straight 6 fuel pump keeps running, won't start, replaced relay and fuel pressure regulator, still having the same problem

asked by on October 06, 2016

Fuel pump comes on then cuts off. Truck starts then stalls. Fuel pump is running constantly. Won't let truck start sometimes if I wait a few minutes. Pump will stop and truck will run. It started this about a year ago then after a couple days, it stopped for about 4 or 5 months and then it started again and after a couple days it stopped and is getting progressively worse. I've replaced relay and the fuel pressure regulator, both did not help

Car is stalling Inspection $94.99 - $114.99 Get a Quote

Hi, thanks for writing in. You need to have the fuel pressure checked to see if the pressure is low. The fuel pump inlet screen may be getting clogged causing the pressure to drop off but the pump will continue to run. You may need to replace the pump if it is not producing enough pressure. If you have dual tanks then you may have a defective switching valve in center of vehicle on frame. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to test the system for you, and make or suggest any repairs as needed.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car only starts when I pump the gas pedal.
From this description it seems that there could be separate issues happening to your Mitsubishi Eclipse. The three most common reasons I see for a car unable to start without pushing the gas pedal include; the throttle body gasket may...
Service Engine Light staying on.
This code is for the oxygen sensor (O2) heater control circuit. O2 sensors in modern vehicles use a heating element to bring the sensor up to operating temperature faster. This allows the powertrain control module (PCM) to use the sensor...
Vehicle stability control warning lights on
VSC stands for vehicle stability control system, it uses the wheel speed sensors along with the brake system to safety control, slow, or stop vehicle. This is done by it's ability to read the speed of each wheel and modulating...
Engine cranks but wont start.
From what you've described, it sounds like your timing belt teeth are broken off at the crank gear. You may have bent the valves now since the engine was turning and the cam was not. If this occurs it can...
Interior lights quit working
Hello. There may be a problem with the combination switch (https://www.yourmechanic.com/services/combination-switch-assembly-replacement) or a headlight switch (https://www.yourmechanic.com/services/headlight-switch-replacement). It is also possible that there is some damage to the wiring of the dashboard, interior lights, and fog lights. I suggest that you...
Engine code P0130 - Oxygen sensor
The code (https://www.yourmechanic.com/article/p0130-obd-ii-trouble-code-02-sensor-circuit-malfunction-bank-i-sensor-1-by-paul-lancette) is for the oxygen sensor not putting out enough voltage, causing the vehicle to run rich all the time since the computer thinks it is running lean until the computer reaches its rich limit. Check the oxygen...
Overheated, power steering went out and battery went low
Hi There, What you have described sounds like your serpentine belt (https://www.yourmechanic.com/services/serpentine-drive-belt-replacement) may have come off. As you may know all of the accessories (ie alternator which charges the battery, power steering and the water pump) are driven by the...
Ford Explorer sport not shifting/running right.
Hi there. Thanks for writing into YourMechanic.com about your Ford Explorer. It's possible that you have a transmission speed sensor or other sensor that is sending inaccurate information to the ECU, or you have a mechanical issue inside the transmission....
1996 f350 with 351w want to swap to 12 valve Cummins, how do I do it legally?
Hi there. To be honest, this would require you to replace not only fabricate new motor mount brackets, but completely swap out engine, transmission, drive shaft components. The V-12 is a much longer block so everything behind it would also...

Related articles

2012 Chevrolet Malibu vs. 2012 Ford Fusion: Which One Should I Buy?
When you want a midsize sedan, you’re looking for something that will offer you the best fuel economy for the size as well as additional safety features that will keep your family safe while you’re driving across town or around...
How Long Does a Fuel Filler Cap Last?
Having Having the right amount of gas in a car is vital in cranking and running the vehicle. Each of the components in the fuels system play a vital role in ensuring that the car runs as it should. The...
Understanding Ford Intelligent Oil-Life Monitor (IOLM) System and Lights
Car symbols, or dashboard lights, are a car service reminder. The Ford Intelligent Oil-Life Monitor indicates when and what service your car needs.