F150 Fuel Pump Replacement

[greenbullitt]

What code did you have that "pertained to the fuel pump" a number would help Pxxxx, the rough idle could possibly be the upper intake gaskets being old and shrunken, it can create a small vacuum leak. Common practice on ford and mazda vehicles in the late 90's and early 2000's was to turn the check engine lamp on during cranking if the ecm didn't receive a crank position signal.

p0171/p0174, that would make az sell you a pump...probably needs a vac elbow on the back of the plenum

OP, more info please

[shumpertdavid]

p0171/p0174, that would make az sell you a pump...probably needs a vac elbow on the back of the plenum

OP, more info please

You read my mind sir, forgot about the elbow though good point.

[BlueCoupeRedVert]

p0171/p0174, that would make az sell you a pump...probably needs a vac elbow on the back of the plenum

OP, more info please

Mine needed this..

[FoxBodyNick]

p0171/p0174, that would make az sell you a pump...probably needs a vac elbow on the back of the plenum

OP, more info please

lol yep!

[greenbullitt]

You read my mind sir, forgot about the elbow though good point.

I am surprised he recommended a fuel pump over o2s lol, he mustve been hustlin' for the commission!

[shumpertdavid]

A lean or rich code without any other symptoms besides a check engine light or without codes that might help support it always have a broad spectrum potential causes. Most of which seem to be much cheaper than the parts house "technician" recommends you buy. My best friend sells parts locally (for about a year now) and is my go to guy when I order. He's been around the shop side of it with me long enough to know better than to recommend a part based on a trouble code. He makes sure his customer understands he is a parts salesman not a repairman, and that the print out he gives list potential causes and repairs not recommended parts and repairs.

[Rreemo]

Step one disconnect the tail lamp harness at the bumper, step 2 disconnect the filler neck, step 3 loosen passenger bed bolts and remove drivers side bolts, pop the bed up and block or use a jack to hold it up.

Has worked for any ford or GM pickup I have touched

This. I use an old milk crate to hold the bed up....just the right size to wedge between the bed and frame rail.

[Mychael101]

The original code was for a circuit on the fuel pump. I replaced the fuel pump relay and the light went off for a while but the truck was still struggling at freeway speeds at time. Then it left me stranded when it wouldn't start. So I replaced the pump last night and the service engine soon light came back on. Now its a repeating code for misfire on cylinders 2 and 4. I replaced the spark plugs and started it up again and its still running like crap and the light is still on.

edit: forgot to add that I replaced the pcv valve as well

[Mychael101]

I checked the coil pack and the terminal for one of the misfiring cylinders appeared to be burned up. Thankfully, that is a lifetime warrantied part so I'll replace that and see what it does. I checked the vacuum lines and all looks well so far.

Now I'm stumped. This is the list of what's been replaced:

Spark plugs, spark plug wires, ignition coil, pcv valve, fuel pump relay, fuel filter and fuel pump assembly. Truck still runs crappy while in gear at a stop. Any guesses now?