Donohue96M6Z28

iTrader: (64)

Im curious as to what everyone fuel pressure reads while the key is in the on position, when it is running, and under acceleration? My autometer fuel pressure gauge reads at 20 when its in the on position, ~30 when it is running, and under accerlation it lowers. Also, the more I drive it, the accelertion begins to rise close to 40. I think my gauge is off, but I still dont understand the reason for the inconsistent fuel pressure reading? Is this usual? As some of you know, I got my fuel pump/regulator/filter changed about a month ago. Things just havent seemed right with my car ever since. Also, does anyone in the San Marcos/Austin/SA area have a fuel pressure gauge I can borrow? I want to see what it reads.... Also, my MPG as of my last fill up with 8.5mpg! WTF?!

JMBLOWNWS6

iTrader: (17)

It should be parked at 59 PSI at the rail.

Donohue96M6Z28

iTrader: (64)

Even when the key is just in the on position? And the pressure should rise under accerlation, correct?

Lethal did the work, I've been back a few times (the car died on me while driving etc etc). But to be honest, I think I just got a bad pump from the get go.

BizZzatch350

iTrader: (33)

Put a mechanical gauge on the schrader valve, thats how I check mine. I use a Hypertech I got from Thunder, wasnt't all that much, come with enough hose to tape it to the windshield so you can check the cranking psi and while running at an idle

Donohue96M6Z28

iTrader: (64)

Ya, I'm hoping to borrow one in the area. I was at Orielys(sp?) the other day and saw one for ~$50. Is that pretty much the going rate?

BizZzatch350

iTrader: (33)

You may be able to rent one, the one from Hypertech was $46, I'm sure it's just a Hypertech box and some one elses parts like their thermostats.

SiL3NtXWS6

iTrader: (17)

should be 58,58,58 for a stock-style system on a fbody

Donohue96M6Z28

iTrader: (64)

Autozone loaned one out to me for a $150 deposit... Anyways, I just got done. The PSI is as follows...

Key in on position... 40psi
At idle....58-60psi
Under acceleration...55-58ish psi
now when the key is in the on position its at 52psi

I posted this in the fuel section a while ago, and one of the sponsors was saying its not normal for the PSI to drop under accerlation. But I've had a few say it was normal. Can someone clarify this for me?

Also, it seems to me that when my car is off. Its losing some of the pressure... which is why it showed 40psi, but then after driving it was showing 52psi.

Any info/advice is appreciated.

Patrick.

rooster99ss

iTrader: (8)

that's where mine sits. for some reason, it drops about 12 psi when i spray the car on a wet kit. don't know if it's supposed to do that or not. i have a walbro 255 fuel pump on it :dunno:

SiL3NtXWS6

iTrader: (17)

That's a pretty big drop, on my old car i ran the racetronix hotwire and their pump, never had a drop like that when spraying. My current fuel system is boost referenced, so i experience a drop to about 40-45 when boost hits, then it spikes about 65 as the external pumps have kicked in.

JMBLOWNWS6

iTrader: (17)

It shouldnt drop that much. It should stay steady 1 to 1 all the way up. All the systems Ive done may see a min fuel rail pressure at 55. I reference the base line rail pressure at 59 psi and end up at 65+ at the end of a run. Just my .02

daniel6718

iTrader: (36)

59 all the time...if you post this in a section it belongs and not texas youd prolly get better responses

rooster99ss

iTrader: (8)

yeah, i don't know what's causing it. It just sputters through the nitrous right now, and is actually faster on motor. I've got a lot of problems that i have to work out on the car thanks to the crappy *** work that's been done on it