fltdriver

This thread is almost 4 years old, assuming the guy has either fixed it or sold it.

Keysford

First time got inexpensive pumps, the second time around got the good ones from NAPA

Chris_1

iTrader: (1)

I know people have had better luck with NAPA pumps, but I don't know how they stand up long term.
We know motor craft pumps last really well. I think they use Walbro for the actual pump.
It could be a problem with your truck, of course, but most guys who plan on keeping their truck long term and don't want to worry about the pumps insist on motorcraft.
I know they charge a lot more but....mine are 19 years old and still pumping 43 psi. I might just be lucky, but I do hear the same thing a lot.

Keysford

Thanks Chris. I don't think it is the pumps. I keep switching back and forth between front and back. Don't think they would both go bad at the same time. Seems to me something is heating up, and at a certain point it just shuts down the fuel flow. I put in two new 30 amp relays, but a friend suggested I try 10 amp relays.

Chris_1

iTrader: (1)

You could check the voltage to the pumps.
Would be worth checking the fuel pressure too, in case it's not the pumps. (spark ?)
Worth checking the tps as well.
There is a connection under the fuel pump relay that can go bad (due to constant current maybe ?). Gotta unclip the power distribution box and take the bottom off to check that.
And there's always the computer itself, which sounds real bad but is actually cheaper than a lot of other parts.
That's all I've got at the moment.

Keysford

Thanks much. I will pass these idea on to the guy who works on the truck for me.