Skip the auto shop - Our mechanics make house calls

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

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

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.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • 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

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

Get a quote

What others are asking

Q: Fuel pump relay location on a 96 Ford Thunderbird.

Hi there. The fuel pump relay is located on the fuse box, the second relay on the bottom near the locking tab. The location port is C1051 for the fuel pump relay. If you need further assistance with the fuel...

Q: Car blows white smoke

Hi there. White smoke can come from the exhaust on this truck for a number of reasons. The most common cause is a failing fuel injector that is allowing excessive amounts of fuel to enter the engine. It can also...

Q: Leak in fuel line

First of all, I recommend that you do not continue to drive, since the leak can cause a fire hazard. I recommend that you have a mechanic, such as one from YourMechanic, come to you and inspect your car to...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.