fuel pressure question

[CamaroAJ]

new GM cars with fuel injection have a check valve in the fuel pump module, we'll just use 4th gen camaros for example since thats what the doner car for me is.

what is everyone doing with the aftermarket pump and tanks? are you priming the system before you crank the engine over to build fuel pressure? is there a aftermarket check valve inline that i have missed that will hold fuel pressure so when i hit the key it will fire right up while the fuel pump builds pressure?

on my '67 i used a aeromotive pump and regulator and just turned the key to run for a few seconds to prime the system then cranked it over. while its not a huge deal i still rather not have the fuel system bleed down so i don't have to prime.

[CarlC]

Standard Walbro pumps like the GSS340 have a built-in check valve in the outlet port. If you look into the port there is a three-section plastic piece held in by the aluminum ring at the outlet end. When using this pump I would usually just turn the key to IGN for 1/2-second to let the pump pressure up before going to Start. Just turning the key did not make much of an engine-start time difference, it was just my routine.

Unless everything in the system is leak-free the pressure is going to bleed off.

[parsonsj]

My FAST XFI had a programmable prime parameter (say that 3 times fast). I found 4s worked pretty well for me with Aeromotive pump/regulator/filters/fuel rails.

jp

[CamaroAJ]

i used on the '67 and also useing on the '69 the entire '01 camaro harness and system so when i turn the key to on it has the normal GM 2-3 seconds of prime. when other people would start my car and i didn't tell them about the prime part they would just crank it untill it started.

thanks Carl i'll look into the walbro pumps when i get to that point.

[MCMLXIX]

Walbro GSS340 top view