Okay.. So I got an FD fuel pump. It does bolt in.. just not the set of bolts I was expecting

I put an S4 sock on (clean), and my fuel filter was replaced in the spring. With the TII pump the car works PERFECT, except at high rpm WOT in 3, 4, 5th.

I swapped the FD pump in, ghetto-way... the car worked fine for a bit (was hard to start, didn't like to idle, but mostly OK, but would break up and stumble/backfire at high RPM. It got steadily worse and worse and worse. I pulled the pump again, put it in *correctly* this time.. fired the car up.. seemed to work PERFECT! For about 2 minutes. Then it started being crappy again. It got to the point where I had to richen the s-afc 50% to make the car idle, and any time I touched the throtte enough to open the TPS 100% the car would die. if I give it WOT at idle it would take about 10-15 seconds to rev to 3000RPM. seemed to rev more cleanly at high rpm (with no load). With load wouldn't rev.

It got so bad that I had to pull the pump and swap the TII one back in on the side of the road (at midnight in the country!) not fun. ran PERFECT once I swapped the TII pump back in.

My alternator is iffy, but getting replaced on monday.

I'm tired of smelling like 94 octane.. what's going on here? What are the suspects?

 

Sounds like a bad pump. It should be a direct swap that doesn't require any mods.

 

Any other possibilities? The seller insists that the pump is OK.

 

Bump

 

yeah.......... he is lying no I don't know never had that problem before however I've never had a bad pump before either.

 

Make sure all the seals are on the pump in the right places and that they are on firm.

Sounds like a leak.

Mine did that when the O-ring right above the pump shattered.

 

Bump? Could it be anything else?

I'm almost 100% sure it couldn't be leaking from anywhere...

 

1) car ran okay with old fuel pump
2) you installed FD pump, car no longer ran fine
3) reinstall old pump, the car runs again

What does this tell you? .. The pump is screwed...
The FD pump is a direct bolt in to replace the stock one (I used to run one) .. so there really isn't any way to mess up the install of it.. you reinstalled the old pump and the car runs again.. this eliminates any problems with any other components in the car, and it also verifies that you have the ability to hook up the fuel pump correctly, so user error isn't in question either...

The only other thing that could cause a problem.. if you look at the outlet nipple of the fuel pump.. you should see a plastic checkvalve .. this checkvalve allows fuel out of the pump, but not back in.. this keeps pressure in the fuel rail when the car is shut off.. this checkvalve is a rather simple item made of plastic and a plunger type valve .. you can easily take a small screw driver and pry out the checkvalve.. .then try installing the pump again and see if that helps.. if it doesn't, as people have already mentioned in the thread.. the fuel pump is hooped.. go get your money back..

 

Thanks chris.

This is what I thought, but the seller INSISTS that the pump is okay, so I thought I'd rule out all other possibilities.

 

bump.. maybe something else?

 

LOOK its TIM, Ryans father. When you came to my house to get the pump you tried to lie to me about what you and my son agreed to for the the price. You tried to say that it was 50 bucks and you knew full well it was a 100. Then you told me that the engine was cutting out and you thought it was the T2 pump. Thats why you wanted the new used pump so bad. So my son met you at some car meet and you swapped the pump in at the parking lot and it and ran the same as it did before. If the pump was bad it would not have run at all.You may have not installed it right. Due to the fact that it came from a twin turbo, it may be a two speed pump,which therefore may be activated by a computer signal to boost pressure when the second turbo kicks in. So now that you found out that the pump is not the problem, the only recoarse was to say to Ryan that the pump is defective.

So heres how it works, There was no warranty with the pump to which I knew is a working pump. Due to the fact that you had dissassembled it and messed around with it I don't want it back. Its yours.

Tim

 

That sort of sums it up, but if your still wondering about either pump, disconnect the fuel line at the filter and jump the fuel pump connector, and turn the key on. It'll tell you in a hurry if either is bad.
Seems as though you have some other problems which were omitted.

 

Nope, simple single-speed pump just like the FC's.

 

grr.