Can one of the pumps go out ro will both go out at the same time? Logic says one could go out, but I thought Ford might have a safety feature built in that would shut the other down or a check engine light or something? Also is this a common problem or is there any other common fuel part failures?

I'm hoping sometime next week I will be able to datalog my parameteres and have a better idea of whats going on.

Thanks Mike

 

I don't have an ansewr for you on that just a little info for ya...

I installed my new 255's and the truck started but stalled right away the would not restart. Come to find out the fuel line in the tank poped of and wouldn't let the truck start. Went back in put the line back on only this time I tighten the clamp with a socket and not a screw driver.

Suavy

 

The two fuel pump wires are daisy chained, so I can't believe it could know anything other than low fuel pressure and/or flow. I know the fuel pressure regulator boosts pressure under boost, maybe by increasing voltage. My '99 used to fall on its face well before redline. 255's cured that! I still haven't tested the original pumps to see if one may have failed.

 

Sorry to intrude, but what is the rating on the stock pumps?

 

The computer controls the voltage going to the pumps. I think it is a dual voltage system.

 

One can definitely go out while the other still works... If you lose the low speed pump, you'll have a HECK of a time getting it to a dealer, or home for that matter. (Don't ask, I know ALL about it )

 

Mike, if you need a new stock pump and you're willing to pay the shipping I will send you one of my extra's. It is practically new, maybe 1200 miles on her.

Just buy me a beer one day.


D-Day

 

Thanks for the offer, but if I pull teh tank down factory pumps aren't going back

I think that is a definite, but I'm not sure that is the problem. I went back to the original pulley setup (9/ 3.5) which is 11 psi on my truck. It runs good until the end of 3rd gear and it seems to break up at that point, which is really puzzling. Of course the smaller pulley combo really elevates the problems.

Thanks Mike


Now that I'm at home and not at work I'd like to go back and clarify my above statement. I have been running that pulley combo for about 6 months without any problems. The local tempature dropped about 10 degrees and I had a little pinging come into the picture. I fealt a reburn was all that was needed. Since I was getting it reburned I decided to go ahead and put the blower pulley I originally planned to run on my truck. This is when the problems started. The pinging and breakup was so bad at part and light WOT that I had gotten the wrong porgrams by accident. After trying other pulley combinations with no better luck I figured something has to be wrong. I went back to my original pulley combo (listed above) with no pinging, but I did notice it breaking up at the end of third gear which is crazy. These programs are for alot more boost and it should be way safe on the above combo. I hope to be able to datalog some of this stuff next week, but I was really trying to find out if one pump could go bad and teh truck run and drive fine or if maybe there are any other common fuel problems? I'm sure a new set of pump is necessary, but I should be able to do more with the ones I have.

Thanks Mike

 

ttt