Fuel pressure 30,40 20 psi???

[101vet]

So tomorrow hopefully if the UPS man comes a knocking i can install my Dizzy and new ICM, Until then i fiddle with things...

So i have a question about fuel PSI, When i key the ignition it comes to 40PSI 3-5 secs, then drops to 30PSi once started, raise the throttle (quick snap of the go stick ) it jumps to 35psi, No surging and holds 30psi while at idle. reason i ask is i've been tracking down my crank no start, and noticed that if i crank it and it doesnt start and key the ignition 2-3 times it'll start, So i did the Fuel PSI test.

Is this with in spec? I tried looking but my phone isn't being nice today.... 95 5.0ltr car in question. Also if anyone is in Phoenix and would want to lend their knowledge or a hand i'll supply beer and witty banter

 

[RichV]

Yes, that is fine. If you pull the vac line off the regulator it will be at around 40 which is normal. Under vacuum it will be less.

 

[101vet]

You are correct sir...Thanks for the response.... Ill move back to the ignition side of things for now

Sent while in your Mom

 

[Paul]

SPec is 39 psi with the vacuum unhooked.

 

[101vet]

Okey so did the test again today....

Primed to 37psi, started it and was running at 34psi, psi didnt change whether the vac hose was connected or not... Car was completly cold when i did it this time .

First test was after driving home in traffic car was up to temp...

Sent while in your Mom

 

[101vet]

Fuel PSI reg going bad?

Sent while in your Mom

 

[Addermk2]

FPR might not be the issue. Your pump might not be putting out enough.

 

[CC'S95GT]

How old is the fuel filter?

 

[101vet]

Filter is brand new...I left the gauge connected overnight, gonna see what it does when i key it on, In my mind it should give me 40psi during the 3 sec run time prior to start up...

Sent while in your Mom

 

[95opal]

im with addermk sounds like the pump might be on its way out.

 

[101vet]

I agree... Gonna grab one and replace it...

Sent while in your Mom

 

[95opal]

I agree... Gonna grab one and replace it...

Sent while in your Mom

For the couple of extra bucks over a stock pump I would grab a 255lph pump and be done. This way youll be set for any future mods.

 

[101vet]

I was looking at the BBK kit on american muscle.... Has good reviews and a direct replacement...

Sent while in your Mom

 

[toyman]

You want a Walbro GSS340 pump.

 

[101vet]

Why not the 255? I dont have plans on any big power numbers out of the car... Heads,cam,intake,exhaust about it for the motor....

Sent while in your Mom

 

[RichV]

GSS340 is a part #. It is a 255lph.