help checking fuel pressure
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Joined: Dec 2009
Posts: 76
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From: Whitman MA
help checking fuel pressure
How do i correctly check fuel pressure in my 87 coupe?
I have a fuel pressure tester.
What are the correct pressures?
What should I see on startup versus acceleration etc?
Thanks
Ed
I have a fuel pressure tester.
What are the correct pressures?
What should I see on startup versus acceleration etc?
Thanks
Ed
Racer
Joined: Jul 2009
Posts: 454
Likes: 0
From: None None
First off, itll be handy to have a tester with a decent length hose on it to tape the gauge on your windshield to monitor pressure while driving. There will be a metal cap (looks like he cap on a bike tire) I cant remember exactly where it is but I want to say its on the passenger side towards the back of the fuel rail. Once you find that cap, unscrew it and then attach the fuel pressure tester to that nipple. You want to look at the pressure in a few different situations.
-key turned to the accessory position but car still off
-idle while cold
-idle while warm
-while driving under load (this is where tape comes in handy to attach the gauge to the windshield)
I forget the exact psi readings you should get but Im sure someone else can chime in with that. Hope that helps some!
-key turned to the accessory position but car still off
-idle while cold
-idle while warm
-while driving under load (this is where tape comes in handy to attach the gauge to the windshield)
I forget the exact psi readings you should get but Im sure someone else can chime in with that. Hope that helps some!
Racer
Joined: Jul 2009
Posts: 454
Likes: 0
From: None None
This is what I was looking for! The link to my fuel pressure testing experience. I have an 85 but most if not all the info should help.
http://forums.corvetteforum.com/c4-t...s-in-gear.html
http://forums.corvetteforum.com/c4-t...s-in-gear.html
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
should show abt 40 psi with eng not running (only 'abt 40' , most gauges do not come 'calibrated' when new, if you have a 'laboratory service' gauge we can talk in specifics)...after 12 hour sit, should still show 10 psi min (further drop may/may not indicate a big problem)
pressure should remain the same under load.
when the gas pedal is depressed (eng running) the pressure should INCREASE.
pressure should remain the same under load.
when the gas pedal is depressed (eng running) the pressure should INCREASE.
Racer
Joined: Jul 2009
Posts: 454
Likes: 0
From: None None
My problem with fuel pressure ended up being the pump. My fuel pressure was fine until I tried to accelerate hard. Replacing the fuel pump is very easy! It all comes up out of the tank through the fuel fill neck. Just have to remove the fuel door and it comes out that way.
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