Ok, I've owned this truck for 2 years now. Last september the fuel pump quit working, so I replaced it. Now it has quit again. All of a sudden it just stopped working. I pulled it out and put 12V to it, sure enough, it won't run. My truck only has 1 tank so when this happens, it's a real inconvenience! The tank is very clean inside. Is it just my bad luck or has anyone else experienced problems with their fuel pumps? If this is a known problem, are there any alternatives to just replacing it again with the same pump and hoping it doesn't quit again?

Thanks,
Scott


1995 F150 4X4
5.0 Reg Cab SWB
33" BFG MT
https://www.ford-trucks.com/user_gallery/displaythumbnail.php?&photoid=479&.jpg

 

you may want to check the wiring to the pump, because the second should not have quit soon after you installed it. and if that looks ok, you may have just gotten a bum pump, and may have better luck next time. im pretty sure that with electric fuel pumps the only ways to kill them is running them bone dry(gas is their lubricant), bad wiring or just lots of time. good luck

mike

 

I've heard that running them empty can kill them also. I've only run the truck empty once, and that was on the first pump. So that wasn't the problem with this one.

What kind of voltage is the pump supposed to get? Is it always either 12V or 0V? Or does it vary depending on the fuel pressure needed by the engine? ie. 12V at WOT, and something like 8V or 10V at normal cruise. Just trying to understand how it is controlled.

Thanks,
Scott

1995 F150 4X4
5.0 Reg Cab SB
33" BFG MT
https://www.ford-trucks.com/user_gallery/displaythumbnail.php?&photoid=479&.jpg

 

Not sure on the voltage issue, but I would guess it would be a constant 12V (not varying). On the pump design issue, only several manufacturers must have it right. There are a lot of older posts referencing pumps failing after only several months of use. Seems NAPA and Ford pumps have about the best reputations.

 

it should have battery voltage with the engine running or initial key on. the fuel pressure is controlled by the regulator so the voltage to the pump is constant.

 

I have the same truck with a single stock tank (SWB 4x4). Never had any fuel pump trouble yet at 124k. You may want to consider adding that second midship tank....it adds an extra 18.5 gals that is much needed with a 5.8L guzzler. Cost was under $400.

TD

 

Another cause of failure is trash. If the filter sock comes off during or after installation, or has any tears or holes in it, granules of foreign material, even sand can lock up the pump, as it is a gear pump. Make sure to replace the sock, clean around the opening well before removing the pump assembly, and recheck the o-ring seal to make sure no trash can get into the tank.

I installed a new pump in a 91 Ranger tank that I installed in an 83 Ranger (also installed the engine and drive train) with a 90 day warranty and replaced it on day 91. Like you, I applied 12 v to the pump and it would not run. I inspected it, found NO trash. Then as a curiosity, I wired it to run backward, and it broke loose. Of course I trashed it, because the labor is too much to risk it failing again. I am convinced it had a minute grain of sand or sliver of metal from the gears lodged in it.

The pump will always have 12 v, as already stated.

I have also replaced the front pump in my 88 F150, several Mustang pumps, Rangers, and my 54 F100 pump (Ranger tank and Mustang engine). Only the one mentioned has failed. I Still do not enjoy replacing them.


Winford

 

Thanks for all the input guys, I'll be replacing it this weekend. Unfortunately, I didn't buy it from Napa or Ford. I bought it from a local store about 100 miles from where I live now. Now I have to bring it back there for a free new one. What a PITA this is.

TD,
I'd like any more info you could give me on adding the second tank. Who did it for you? Does it work like a regular dual tank setup? ie. Switch on the dash to switch tanks. I think it was one of Ford's dumbest ideas to only put one small tank in these SWB 4X4 trucks.


Thanks,
Scott

1995 F150 4X4
5.0 Reg Cab SB
33" BFG MT
https://www.ford-trucks.com/user_gallery/displaythumbnail.php?&photoid=479&.jpg

 

Yeah, 18 gallons of gas barely takes me 200 miles with the 5.8L pig.
Don't know where you're located but I got my second tank installed at an RV place in Gardena Calif. Check around for any RV service centers that may be able to rig it for you. Mine is designed to pump the aux fuel into the main tank...fuel gauge displays tank level with a toggle switch that also activates the transfer pump. The tank is safely mounted between the forward frame rails. Total fuel capacity is now 37 gals. My only question is: Why the !@#% didn't Ford do this out of the factory? Good luck...

TD