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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 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: Can a bad fuel pump cause overheating and loss of coolant.

Hello. We will be happy to help you. The coolant system and the fuel system are unrelated. If one is malfunctioning it will not have an effect on the other one. The fuel pump is also not belt driven, I...

Q: Oil leaked out, van ran hot and radiator had a leak oil was splattered everywhere and backed up into the coolant jug 2002 Ford E350 Super Duty

Hello - I suspect you will find blown head gaskets based on the oil in the coolant" observation, with indications of extremely high pressure coming into the cooling system. Hopefully the determination you have that cylinder heads themselves were not...

Q: Locate master reset button on top of motor

Hello. The only sort of reset switch equipped on a Ford Expedition would be the fuel pump inertia switch. The purpose of this switch is to cut off power to the fuel pump if the computer detects a harsh impact,...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.