4 cylinder to 5.0 conversion

saleen243 · 02-26-2002, 09:11 AM

Last night I crank my car after a month of swapping parts. Just to give everybody a little back ground, here is what I have done: I bought a 89 coupe 4 cylinder and I gutted the car pretty much. I took a 87 GT parts car and swapped all the necessary parts over to make the coupe a V8. I got a 88 mass air harness and all my wiring matched up. I used the helms books for reference. The reason I did the swap was to keep busy from modifying my saleen to the point of no return. Now back to the future:

The car crank and ran fine for about 15 - 20 minutes!!! Then it just stopped running. I turned the key forward but the fuel pump did not come on. The car did crank over but no fuel pump noise etc. I checked the relay under the left seat and it was kind of warm, swapped it out and turned the key froward still no fuel pump. I think the pump died, it was the original 4 cylinder pump and my plans where to run it till it died., then replace it with a 190 pump for future upgrades. I also plan to get a fuel pressure regulator and fuel pressure gauge for the fuel rail. What do you guys think??? Did the pump die or is there something else I should check, when I bought the car somebody has spliced a black wire into the the harness that plugs into the fuel tank and grounded it to the rear bumper. I do not know if this was done because of past problems with the 4 cylinder fuel system. I replaced that harness with one from the 87GT parts car. Where is the ground for the fuel pump located?? I know there is a chasis ground some where. I have another fuel tank standing by to be setup for the new pump etc. Any suggestions would be appreciated???????? Thanks!!!!!!!! Sorry so long but I wanted to present the full picture......

mean81GT · 02-26-2002, 10:16 AM

did you check to see that the pump was getting voltage? if not, it could be a ton of things. most of them you probably know, fuse, ground, etc. if it is, it is the pump, IMHO

saleen243 · 02-26-2002, 03:15 PM

Just came home for lunch and decided to do some trouble shooting. I turned the key forward and the pump came on and the car crank. It ran for a little bit and then it died. Turned the key forward and nothing from the pump!!! I think it is the pump at this point!!! Anybody have any ideas???????

90'5.0 Conv · 02-26-2002, 09:30 PM

This is just a guess but it sounds like you may have some trash in it and it dislodges after sitting a while. Just an idea, hope it helps.

James

90'5.0 Conv · 02-26-2002, 09:35 PM

Just thought about it a sec and if the pump doesn't so anything after running a while. It definitely sounds like the pump is bad. I really don't see it being anything else. Did you see if it's getting voltage when it isn't running?

saleen243 · 02-26-2002, 09:45 PM

Dude, I was born in Albany GA!!!! Thanks for your suggestion!!! I swapped out the pump and it is working but I have not put the tank back up yet, I am planning on pulling the tank out of my parts car and putting in the 190 pump I ordered today!!! Everytime I turn the key now it works, so i will just have to test for a couple of days until my new pump arrives. I figured i should do the work for the blower now instead of twice!!!!

02-26-2002, 09:11 AM	#1
saleen243 Registered Member Join Date: Aug 2001 Location: VAFB, CA Posts: 47	4 cylinder to 5.0 conversion Last night I crank my car after a month of swapping parts. Just to give everybody a little back ground, here is what I have done: I bought a 89 coupe 4 cylinder and I gutted the car pretty much. I took a 87 GT parts car and swapped all the necessary parts over to make the coupe a V8. I got a 88 mass air harness and all my wiring matched up. I used the helms books for reference. The reason I did the swap was to keep busy from modifying my saleen to the point of no return. Now back to the future: The car crank and ran fine for about 15 - 20 minutes!!! Then it just stopped running. I turned the key forward but the fuel pump did not come on. The car did crank over but no fuel pump noise etc. I checked the relay under the left seat and it was kind of warm, swapped it out and turned the key froward still no fuel pump. I think the pump died, it was the original 4 cylinder pump and my plans where to run it till it died., then replace it with a 190 pump for future upgrades. I also plan to get a fuel pressure regulator and fuel pressure gauge for the fuel rail. What do you guys think??? Did the pump die or is there something else I should check, when I bought the car somebody has spliced a black wire into the the harness that plugs into the fuel tank and grounded it to the rear bumper. I do not know if this was done because of past problems with the 4 cylinder fuel system. I replaced that harness with one from the 87GT parts car. Where is the ground for the fuel pump located?? I know there is a chasis ground some where. I have another fuel tank standing by to be setup for the new pump etc. Any suggestions would be appreciated???????? Thanks!!!!!!!! Sorry so long but I wanted to present the full picture......

02-26-2002, 10:16 AM	#2
mean81GT Registered Member Join Date: Nov 2001 Location: NY Posts: 299	did you check to see that the pump was getting voltage? if not, it could be a ton of things. most of them you probably know, fuse, ground, etc. if it is, it is the pump, IMHO __________________ I'm a glutton for punishment.

02-26-2002, 09:30 PM	#4
90'5.0 Conv Long time member in and out Join Date: Jul 2001 Location: Albany, Ga Posts: 343	This is just a guess but it sounds like you may have some trash in it and it dislodges after sitting a while. Just an idea, hope it helps. James __________________ 90' Mustang GT Convertible- C4 w/ manual body 4.10's soon to be 3.27's 2 Ch Flowmasters 1/8th ET 9.04

02-26-2002, 09:35 PM	#5
90'5.0 Conv Long time member in and out Join Date: Jul 2001 Location: Albany, Ga Posts: 343	Just thought about it a sec and if the pump doesn't so anything after running a while. It definitely sounds like the pump is bad. I really don't see it being anything else. Did you see if it's getting voltage when it isn't running? __________________ 90' Mustang GT Convertible- C4 w/ manual body 4.10's soon to be 3.27's 2 Ch Flowmasters 1/8th ET 9.04

02-26-2002, 09:45 PM	#6
saleen243 Registered Member Join Date: Aug 2001 Location: VAFB, CA Posts: 47	Dude, I was born in Albany GA!!!! Thanks for your suggestion!!! I swapped out the pump and it is working but I have not put the tank back up yet, I am planning on pulling the tank out of my parts car and putting in the 190 pump I ordered today!!! Everytime I turn the key now it works, so i will just have to test for a couple of days until my new pump arrives. I figured i should do the work for the blower now instead of twice!!!! __________________ 2002 F150 SuperCrew 1990 5.0 LX Coupe 1989 Saleen Convertible #243 1965 Fastback - 331 Stroker/T-5 swap

02-26-2002, 03:15 PM	#3
saleen243 Registered Member Join Date: Aug 2001 Location: VAFB, CA Posts: 47	Just came home for lunch and decided to do some trouble shooting. I turned the key forward and the pump came on and the car crank. It ran for a little bit and then it died. Turned the key forward and nothing from the pump!!! I think it is the pump at this point!!! Anybody have any ideas???????

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