Cold weather Aeromotive afpr issues

[95 gsx]

I had a problem recently with my Aeromotive fpr. I only had it installed for a couple of weeks but it wasnt working out for me so I re-installed the stock fpr. Ever since I installed it, cold starts took much more cranking time to get the engine running. (3-4 sec. of cranking as opposed to almost instantly with the stock fpr) I researched that problem and I noticed that others had identical issues so I just decided to live with it. One other problem I had that I believe is related happened on a really cold morning (below freezing). I couldnt get the car started right away. After about 5 minutes of periods of cranking and waiting, I finally got it to start. I let it warm up a little and then took off but the car wouldnt accept any throttle above idle. I stopped the car and checked the fp on the aeromotive unit and it read 15psi with the engine running. I bumped it up to where it was when I set it (34-ish psi) and the car ran great. Before I got going again, I rechecked the fp again and it read 55 psi. I turned it back down to 33-34 and went on my way. I didnt have that problem again but I removed the fpr anyway as the excessive cranking just to get the car started got on my nerves. Is this fpr on its way out? Could it have a bad seal? Could there have been moisture inside the fpr that morning and it froze?

Cliffnotes: Cold morning start-up, fpr reads 15 psi and car runs like crap. Only happened once.

-95 gsx

 

[brute]

When you got the FPR, did you install the spring for fuel injection or did you leave the carburetor spring in? Fuel injection has much higher fuel pressure than carbureted cars. Also, do you have the jam nut on top? Maybe the allen-headed stud is turning itself. Make sure the jam nut is on there.

 

[95 gsx]

When you got the FPR, did you install the spring for fuel injection or did you leave the carburetor spring in? Fuel injection has much higher fuel pressure than carbureted cars. Also, do you have the jam nut on top? Maybe the allen-headed stud is turning itself. Make sure the jam nut is on there.

High pressure spring is installed, with static pressure set at ~43psi. Jam nut was also installed when this happened. I guess you could say it just happened out of the blue, and maybe it could be a problem with the fuel pump starting to fail....dunno.

 

[GVR4592]

You shouldn't be adjusting it with the vacuum line connected. Set it to 43 with the line off. You should also let the fuel pump prime for a few seconds before you try to start the car.

 

[95 gsx]

You shouldn't be adjusting it with the vacuum line connected. Set it to 43 with the line off. You should also let the fuel pump prime for a few seconds before you try to start the car.

I thought static pressure meant with the line off, or maybe that's base pressure? Sorry to confuse you but I adjusted the pressure to ~43 with the line off. With the line attached I see about 33-34 psi (@ 19-20 inch vacuum) which by my calculations, is right on. Im not sure about this car but when I turn the key to the on position on my non-turbo, the fuel pump pressurizes the system before the engine starts. My factory turbo does not. Thank you for your help.

 

[linksys42]

2g’s don’t prime the fuel system when you turn the ignition key to the on position. 1g’s do, I have the exact same problem you do except for the cold morning incident you had (because mine hasn’t seen that cold of a morning). Mine also is hard to start after sitting for awhile. I think it’s because the pressure with the aeromotive AFPR drops off to 0 immediately when the car is turned off. I was concerned about it also so I just threw my stock FPR back on. I would like to know if this is common? And if everyone else’s does this also?

 

[bling5tatus]

Damnit, I want to get an aeromotive afpr also, but not if it's going to be a problem.... and if I put it on, I definitely don't want to take it back off and go stock again. I hope someone can figure this out or pin point it to this one application having a problem.