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Fuel pump relay location 2001 f250 5.4L Replaced fuel pump and inline filter and hit the key still had no fuel pressure....installed pressure guage on rail and had no pressure at koeo or while cranking and after about 10 or 15 tries the pressure slowly came up and engine ran. I doubt that the problem resolved itself and will happen again...I suspect the relay but can't find it in the owners manual and Ford was completely useless..wouldn't tell me...help.
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My info says fuel pressure 55--62 psi. Yes, probably the fuel pump. Usually low pressure is a problem on the supply side. You can be thorough, check proper voltage and ground at fuel pump connector. Check inline fuel filter. I've checked inline fuel filters before where the fluid that ran out looked like dirty water. Don't take connections loose from inline fuel filter unless your sure, no pressure on the system.
You could block the return line, where applicable, momentarily, to see if pressure will go high. If not, it should be the pump.
install a fuel pump guage and check pressure at key on and start, it should hardly vary, it the pressure is constant check the injector signal with a noid light, while you are at it check spark(no spark no injector signal) you won't find a relay fuse
Removing the relay would not releive the fuel pressure. Arc across the fuel relay terminals and jump start the fuel pump. Also check to make sure the fuel filter is properly installed.
MEASURE FUEL PUMP PRESSURE AT FUEL FILTER CONNECTOR. ATTACH PRESSURE GUAGE TO FITTING COMING FROM TANK. MAKE SURE THER ARE NO LEAKS FIRST THEN HAVE SOMEONT TURN THE IGNITION ON CK. GUAGE PRESSURE TURN KEY OFF PRESSURE SHOULD REMAIN CONSTANT SINCE PUMP IS DEAD HEADED ( NO RELIEF/ REGULATOR) IF PRESSURE FALLS ,PUMP INNER CK VALVE IS LEAKING. IF PRESSURE DOES NOT FALL THEN SUSPECT REGULATOR
It sounds like the fuel pump is not working. Perhaps the install was not completed correctly. Things to check, fuel pump relay, wiring, voltage to the pump.
The priming happens as soon as you put the key in and turn it to "acc" (you may hear a humming sound). Then once you turn it to "start" the injectors and spark plugs start firing.
Another possibility is that the fuel filter was installed backwards.
sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered
The filter is located at the rear seat, you have to remove it first, then you will see a cap attach with some screws. Inside that cap you`ll find the fuel filter. Before you change the fuel filter you have to release the fuel pressure first. To do that, first find the FUEL PUMP RELAY in the main fuse box located in the engine. Once you located open the fuel door and take off the cap and leave it open. Start the engine, take off the FUEL PUMP RELAY and leave the engine stop itself, when this occurs turn off the key, the you can take off the filter and changed it
You must check for power and ground to the fuel pump ,you will have power for approx. 2 seconds with key first turned to the run position and then you will have constant battery voltage during cranking. You may also want to go to AutoZone .com or Alldata.com and bur online manuel for you Daewoo.the are very reasonable and informative. If you find you have correct voltage supply and ground, and assuming the fuel guage is correct and there is fuel,it is very likely you will be replacing the fuel pump , strainer and filter. Don`t laugh on the fuel guage comment, I have had several vehicle towed in to me for no starts, only to find the guage not reading correctly , and the vehilcle was out of fuel.Good luck I hope this helps.
Brett
Where the car runs on starter cleaner, this is definitely a fuel problem...
Could be a few things:
Do you hear the fuel pump running outside the car (for a few seconds) when you turn the key on (engine off)?
If not it might be the pump or the pump relay (in the engine compartment fuse and relay box)
If so, it might be:
Clogged inline fuel filter (in the fuel line from the pump to the engine)
Bad fuel pressure regulator
Bad injectors/wiring
Did you check the fuse and wires to see if you have power (and a good ground) to your engine computer (controls fuel injectors), this could also be the culprit (without power to the computer there is no way for the engine to get fuel).
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