Need fuel specs for LT1
Need fuel specs for LT1 Can someone tell me what the reading of an 97 LT1 fuel pressure should be? My buddy just got a fuel pressure gauge and was wondering what lbs. it should be reading at. This is a stock motor with some bolt ons. Thanks!
key on engine off 38-41psi
key on engine running it should drop around 3psi
engine running vacuum removed from the FPR should go up 3-8psi
key off engine off pressure should hold around 38psi
key on engine running it should drop around 3psi
engine running vacuum removed from the FPR should go up 3-8psi
key off engine off pressure should hold around 38psi
When my Key is off my fuel pressure drops to 0psi, almost instantly.
Wonder what the problem is their. I do know it use to hold pressure before I installed the Aeromotive adj Fuel Regulator. I have 2 of these and one is brand new. They both do it. Any Ideas?
Wonder what the problem is their. I do know it use to hold pressure before I installed the Aeromotive adj Fuel Regulator. I have 2 of these and one is brand new. They both do it. Any Ideas?
Originally Posted by BRENTT94Z
When my Key is off my fuel pressure drops to 0psi, almost instantly.
Wonder what the problem is their. I do know it use to hold pressure before I installed the Aeromotive adj Fuel Regulator. I have 2 of these and one is brand new. They both do it. Any Ideas?
Wonder what the problem is their. I do know it use to hold pressure before I installed the Aeromotive adj Fuel Regulator. I have 2 of these and one is brand new. They both do it. Any Ideas?
Originally Posted by SmokedOutZ28
do you have a visible leak? if it falls that fast theres a leak somewhere.. with the car running pull the vacuum line off the regulator and see if theres fuel comming out of it, if you can pinch off the return line and if it still drops to 0 then it's either the regulator or one of the injectors. if it doesnt fall then it's the pumps check valve.
I dont have any visible leaks and the AFPR isnt leaking. Have good fuel pressure. Its possible it could be my Injectors. Im using Accell 30lb injectors I bought new 2 years ago.
Originally Posted by BRENTT94Z
Im thinking its the Pumps check valve. Would this cause any harm?
I dont have any visible leaks and the AFPR isnt leaking. Have good fuel pressure. Its possible it could be my Injectors. Im using Accell 30lb injectors I bought new 2 years ago.
I dont have any visible leaks and the AFPR isnt leaking. Have good fuel pressure. Its possible it could be my Injectors. Im using Accell 30lb injectors I bought new 2 years ago.
i also had a problem w/ my pressure dropping off rapidly after the initial prime up, i chased it back down to the fuel hosing that was clamped to the pump in the pickup. Just remember when installing the aftermarket pump, to tighten the shyt out of the corrogated plastic tubing w/ a good clamp, if you do that= no leaks. 
but on a more serious note, check the vacuum source for the regulator, does it smell like fuel, or drip fuel? if so, the regulator is shot. i've also heard things about the aeromotive's leaking. not too sure on what causes this. good luck, happy hunting.
Nick
but on a more serious note, check the vacuum source for the regulator, does it smell like fuel, or drip fuel? if so, the regulator is shot. i've also heard things about the aeromotive's leaking. not too sure on what causes this. good luck, happy hunting.Nick
Trending Topics
Originally Posted by SmokedOutZ28
key on engine off 38-41psi
key on engine running it should drop around 3psi
engine running vacuum removed from the FPR should go up 3-8psi
key off engine off pressure should hold around 38psi
key on engine running it should drop around 3psi
engine running vacuum removed from the FPR should go up 3-8psi
key off engine off pressure should hold around 38psi
Where did you come up with those numbers? Engine idling & vacuum hose off should be 45/47 psi. Pressure drop with the hose on depends on your manifold vacuum.
Take care, Ed
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by Ed Wright
Where did you come up with those numbers? Engine idling & vacuum hose off should be 45/47 psi. Pressure drop with the hose on depends on your manifold vacuum.
Take care, Ed
Take care, Ed
Originally Posted by SmokedOutZ28
i gave him a range to work from i didn't give exact #'s and if hes running at 39 psi and pulls the line off then he will be at 47.. i've owned 3 LT1's and all the stock fuel pressure's were different and they all went up to different psi's.. i didn't know the condition of his fuel system so i was giving ranges.. mine runs @45 with vacuum and @51 without..
Ed
Originally Posted by Ed Wright
Key on & engine off there is no vacuum, pressure should go to about 45 psi & hold.
Ed
Ed
Originally Posted by SmokedOutZ28
so if it goes to 38 and holds but at start up it goes to 41 does that mean we have a bad pump?? haynes manual says 38-41 with key on engine off and thats what i experienced with my latest Z so thats why i said 38-41.
Good luck, Ed
