NO fuel pump...

[Hozer 88GTConv]

Update:
After checking relays, voltages, resistance, etc. I swapped my old speed density computer in to see if the car would act normally.
It did. It ran rough (because it's mass air now) so it looks like a bad eec-iv. Found a A9L for $100.
I'll let you know...

[USMC302]

The relay is wrong IMHO. I had the same thing happen a long time ago, had a guy at autozone sell me a new relay and it wouldn't turn off, brought it back and he said it was the same part number for some other vehicle so he thought it would be the same cause they showed out of stock on mine. Went down the road to Advanced Auto and got the right one, worked great. You said you swapped in the SD computer and it worked, maybe he gave you a relay for a SD 88 mustang, see if they have a different relay for an 89-93 stang.

Not going to cancel out the computer though either. I can't beleive our cars are going to be 20 years old.....

Hey have you ran it at the track yet with the new motor?

[Hozer 88GTConv]

yeah, I hear ya. I've got a handful of these relays. The guys at the Ford dealership said the same thing about some being interchangeable. I've got my doubts...
I can get my damn PMS pigtail seperated from the old computer. I've spent all day basically trashing it so it looks like I get to buy another one of those too...
joy.

[Hozer 88GTConv]

Swapped computer to an A9L. No luck. Fuel pump appears to be working, hear the priming noise and I smell fuel, but the mechanical indicator on the schrader valve indicates NO pressure at all.
I installed a new FPR and still NO fuel pressure, but I smell gas.
I installed two new relays from Ford at the ECM and Fuel pump relay.

Question: I have a FMS mass air conversion, originally had a A3M computer. Is there a chance the A9L is not compatible?
I actually got it to fire with the original speed density computer earlier, but it obviously ran like crap.
But it won't even manage that with the A9L.

I'm beat after working on it all day.
Thanks. Time for beer.

[USMC302]

Ok so wait, you put the SD computer in and it started, meaning you had some pressure in the lines at the schrader valve, but with the A9L, you had no pressure at the valve? If the pump is coming on with both computers, you should still see pressure at the valve. Pull a plug after trying to fire it with the A9L computer, are they wet with fuel or dry? When you swapped the fuel pump out, did you put in a new stock one, used stock one, used aftermarket...etc..? I think I remember cutting or modifying one wire on the ECU harness for my mass air swap, but can't remember which. I'll do a search to see if I can find it.

[USMC302]

You made sure you got the right computer for the right tranny? A few people mentioned before they put in the wrong computer, ( auto in a t5 or vice versa )and it fried a couple things.

[Hozer 88GTConv]

Thanks, USMC.
The fuel pump was a used one I had that was working before I removed it sometime ago.
My immediate concern is the lack of indicated fuel pressure on the gauge attached to the fuel rail. I'm going to open up the fpr and see if that's it. In my haste last night installing it, I didn't adjust it any. So maybe it's closed, but that's pure hope right there.
I'll also check the plugs. If they are dry, guess I'll be dropping the tank again and verifying power is getting to it first, then replacing the fuel pump.

I'm going to call around too about the computer compatability. My understanding from reading around the net is that A9L's, A9P, A3M, X3Z, yatta, yatta, are all interchangeable, regardless of transmisssion.

I'll keep you posted, thanks for your input.