Just did engine swap, SHO won't start

[anarchy04]

I just got done doing my engine swap this morning and I can't get it to start. I know it is something to do with the fuel system. It will only fire when I put gas in the throttle body. It only holds pressure for like 10 seconds after the system pressurizes when the key is turned on. I took off the fuel pressure regulator and tested it and it will hold at least 30 psi when I put it on the air compressor, I say at least cuz I can't get an exact number. Is there something that keeps the gas from going backwards back into the tank, cuz I don't think the pressure regulator is bad, although it could be. Also, there is a plug under the throttle body, there are three plugs coming out of the engine about 4-6 inches under the thottle body, but I can only get the black and grey round ones connected and there is one that looks like it is the female side of a three plug oval shaped connector and I don't know if it connects to something or not. Lastly there is a vacum line plug on the backside of the intake and I can't find a line to connect to it. It is six sided like a bolt and has a plug thing like you would hook a rubber vacum line to. The plug comes out the side of the six sided thing that screws directly to the back of the intake in the tank thing that says Ford on it. I would greatly apreciate any help you could give me on any of these problems. Thanks

 

[SHOTIME]

OK the vaccum line is easy, it starts on the firewall near the strut tower. should be under the EEC-V test ports.

Fuel, Have you actually tested it? does it prime to ~40 PSI and then quickly fall? Or does it not even prime? This will tell you if there is a fuel pump problem, or if there is a fuel leak.

And the connector your talking about, can we get a picture?

Lastly, year of the car?

 

[Bizzy]

yeah what eric said. I had trouble figuring out what connector you were talking about under the TB area. Dosen't sound familiar.

 

[Mike Kopstain]

Is this a 3.2 swap?

 

[anarchy04]

go to[ http://f2.pg.photos.yahoo.com/[email protected] ]for the picture, go to the 2004-06-29 album and it is the second picture. It does prime, if you press down the thing in the valve that you check pressure at on the fuel rail and turn the ignition on it sprays gas like 5 feet in the air, plus the car started and ran fine before the rod went in it. Also it is an 89.

 

[anarchy04]

no it isn't a 3.2 swap, the engine is out of the titanium 89 pictured in my signature, which also ran and drove fine before I pulled the engine.

 

[anarchy04]

I just fixed the problem with the picture thing, don't know why it asked you to sign in?

 

[Bryan C. King]

go to[ http://f2.pg.photos.yahoo.com/[email protected] ]for the picture, go to the 2004-06-29 album and it is the second picture. It does prime, if you press down the thing in the valve that you check pressure at on the fuel rail and turn the ignition on it sprays gas like 5 feet in the air, plus the car started and ran fine before the rod went in it. Also it is an 89.

Just because you get fuel to spray out of the shrader valve on the fuel rail dosen't mean you are getting enough pressure to start and keep the car running. You need to get a fuel pressure tester and check it while you are cranking the engine.

 

[SHOTIME]

What bryan said..

Also how did you comfirm spark?

The connector your speaking of doesnt go anywhere. Leave it be.

 

[anarchy04]

It had to have spark to start when I poured gas in the throttle body. I'm going to replace the pressure regulator. I got 28 psi on the fuel rail but it droped off after 15 seconds and the low pressure couldn't have been because of the pump because fuel was flowing through the regulator. Hopfully my friend Josh will give me the one off his junk sho, I just gave him a free tranny for his sho a couple days ago so he owes me.

 

[anarchy04]

I put in the other pressure regulator today and now I still got the same problem. Now I am thinking about getting a Walbro 190 lph pump. Is there anything that that anyone knows of that would cause my pressure to completely go away after 10-15 seconds, I've been through three pressure regulators, two sets of injectors, and two sets of fuel rails. I know none of the injectors leak or anything like that. I guess what I'm trying to say is what is the part in the fuel that stops fuel from going back into the tank, I don't mean the pressure regulator, I mean going back through the pump from the send line. It seems like I'm losing my pressure back through the send line. Is that a bad pump or is there something else that keeps it from going back. Please give me any info you have on this subject

 

[projectSHO89]

There is a check valve in the fuel pump that is supposed to prevent fuel pressure leakdown via the supply line.

Disconnect the supply line and test it with compressed air to verify that the check valve has failed.

Steve

 

[anarchy04]

I figuered out what the problem was, the gas was leaking around the threads to the pressure regulator so it was bypassing the regulator and going directly into the return line. I just put teflon tape around the threads, pumped it up and checked to see if it was holding pressure 5 minutes laters and it was so all this work over a simple fix.

 

[anarchy04]

I take that back, it is holding 35-38 psi of pressure but it isn't a simple fix, my injectors aren't working. Like I said earlier I can get it to run for a few seconds when I pour gas in the throttle body or spray starting fluid in there but it doesn't like to run on pure starting fluid. So does anyone have any ideas what might be wrong, I've tried two computers cause I seen that someone one here had a computer problem but no luck with mine, I put in a different DIS cause my other one is cracked up pretty bad. I'm probably going to swap over the wiring harness from the other car but I hate messing with the harness cuz it has like a ton of conectors and they are hard to get to but whatever. Give me some other ideas if you have any

 

[anarchy04]

Swaped wiring harness and still no luck. I don't know what to do next. I'm on the verge of bringing it to a shop to have looked at but I know it will be $$$ and I would hate to do that if I could have fixed it on my own.

 

[Mr Anonymous]

It might help if you keep your troubleshooting to a single thread rather than multiple threads. Please see my reply to you injector problem thread.