Resolved Car will not start after mods

[mac 108]

I have added a new 16g turbo, exhaust manifold, 02 housing etc, SAFC II, Walbro 255 and the Importevolution.com AFPR kit.

All lines, hoses, and connectors (MAF) are connected. We have fuel (disconnected line from fuel filter) and we have spark (checked with timing light). Coolant and oil and oil filter were all replaced.

Let the car sit for a couple of hours and went back and it would not start. It acts like it wants to start, it seems like it fires for a second (you can hear a little exhaust come out) but then it just doesn't start. What's the deal?

The only possible thing I can come up with is that the under hood gauge on my AFPR does not go very high (maybe 5psi) when the car tries to start.

 

[majik2k5]

Have you tried messing with the AFPR?

 

[oldman]

Have you set the base pressure to 37psi using the fuel pump check connector?

 

[mac 108]

well it is an auto, so it should be 42 psi, but how do i do that?

 

[oldman]

Half way through this article, might as well read the whole thing. Make sure you lubricate the fuel pump o-ring prior to install and check for leaks while you set the base pressure.

 

[majik2k5]

Ahh.. Once again, beaten to it. It's impossible to get any rep. points with oldman still around.

 

[1gnasty]

doble check the wiring on the safc

 

[mac 108]

Well see the thing is, I know we have fuel, because I loosened the banjo fitting from the fuel filter and it leaked fuel big time. Anyone know anything about Aeromotive regulators?

The SAFC appears to be wired correctly, it seems to function properly. Though I did set the cylinders to 2, and the air sensor to Karman, I didn't do anything else.

Could an SAFC cause a car not to start?

 

[oldman]

Ahh.. Once again, beaten to it. It's impossible to get any rep. points with oldman still around.

I gave you a good 10 mins this time.

well see the thing is, i know we have fuel, because i loosened the banjo fitting from the fuel filter and it leaked fuel big time

1. Just because there is fuel, doesn't mean there is enough pressure.

2. Just because you have enough fuel pressure, doesn't mean that the injectors are firing. To exclude fuel out of the equation in a no start situation, one must have both.

anyone know anything about Aeromotive regulators?

I use one, what do you want to know?

 

[mac 108]

Ok so I just need to run that test using the terminal near the battery, after that where do I go? If I don't have any leaks what is the problem?

 

[oldman]

Ok so I just need to run that test using the terminal near the battery, after that where do I go? If I don't have any leaks what is the problem?

1. If the pressure is low and you're not able to raise the pressure, most likely the fuel pump o-ring is ripped during installation. You have avoided this question the first time, did you lubricate the o-ring? This is a very common mistake during a fuel pump installation.

2. If the pressure is low but you're able to set it to 43psi, it's most likely your problem.

3. If the pressure is near where is suppose to be, I would uninstall the safc and see what happens. You have absolutely no need for the safc according to your profile, I hope you have it zeroed out right now.

 

[mac 108]

No I did not oil the o-ring.

I have the SAFC because I have 660cc injectors. I just haven't installed them yet. How do I zero out the SAFC?

I am not going to mention how stupid I feel

 

[oldman]

How do I zero out the SAFC?

http://www.apexi-usa.com/

 

[mac 108]

If I did have correct fuel pressure, wouldn't the gauge on the FPR read more than 5 psi or would it not run a much higher psi until the car is started and runs?

 

[oldman]

The fuel pressure should be up to speed once you start cranking but there is no need to guess, just go through the procedure in setting the base pressure, your afpr/fuel pump installation isn't complete until this is done.

 

[mac 108]

Ok, that is what I will do. I appreciate the help and I will let you know what happens.

The thing is that when we replaced the fuel pump on my 91 GST, we just put it in the tank and everything ran fine. However it was a stock pump, not a walbro. So I figured the new pump would work the same way. Guess I was wrong.

 

[redeclipse7782]

Shouldnt the cylinder be set to 4 and not 2 on the safc?

 

[mac 108]

no, you have to set it to 2 so it reads the RPMs correctly. It has something to do with the coils or something like that.

Checked the fuel pump today, everything is correct. Oiled the ring and reassembled it. Looked at the VFAQ and I can't find the fuel pump check terminal. I looked in the same place as the picture, but there is nothing hanging there. Now there is a similar looking connector hanging on the passenger's side in front of the battery, but that's it.

 

[mac 108]

I got it running today, it was the AFPR that needed to be pressurized and adjusted just like you guys said. I appreciate the help.