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1994-1995 5.0 Mustang SN95 Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


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Unread 04-02-2006   #1 (permalink)
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Default How to check fuel pressure on 1995 Mustang GT?

Since my car spends a lot of time every year in a garage waiting for winter to be over, i believe that the fuel pump mesh filter might be clogged and forbiding normal fuel pressure to reach engine. Is there a simple way to check the fuel pressure? I noticed there is a shraeder valve on the fuel rail and the fuel regulator is very accessible to. If anyone knows how to check the fuel pressure please share your knowledge! By the way, i still have the original fuel pump on the car.
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Unread 04-20-2006   #2 (permalink)
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yea you use the schrader valve, with a fuel pressure gauge, then you remove the pressure regulator vacuum hose and check.
i think the reading should be 39-40 psi
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Unread 05-21-2009   #3 (permalink)
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Question

I just got a new 95 GT and it has a newer fuel pump, but I think stock injectors. It seems to die when I get off the gas and it goes to idle.

My first thought was Idle, but it wouldn't start up for a minute or two. I suspected flooding somehow, so I dialed back the fuel pressure regulator a little and let it idle in the driveway for a few minutes. I found gas coming out of the tail pipes.

I think I'm going to get new spark plugs, and higher pressure injectors, but until then.

How do I tune the fuel pressure regulator in?
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Unread 05-22-2009   #4 (permalink)
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If it has a stock Fuel regulator, your screwed. I have special trick up my sleeve but I dont tell everyone. I dont want them screwing something up and blaming it on me, Plus its only for raising fuel pressure. Only way to adjust, is an ADJ. regulator.
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Unread 05-22-2009   #5 (permalink)
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I just re-read your post, so I guess you have and ADJ. regulator. Set the Fuel pressure with the vacuum line off. 40psi should be good.

The regulator my be bad, and allowing fuel into the intake. But if its so rich that gas is coming out the exhaust, you have an underlying problem. And bigger injectors wont help.
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Unread 05-22-2009   #6 (permalink)
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Is your trick to mash the top of the regulator down to increase pressure? That was one of mine.
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Unread 05-22-2009   #7 (permalink)
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Ha Ive been busted. Its an old mechanics trick, but it does work as far as raising fuel pressure a tad.
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Unread 05-23-2009   #8 (permalink)
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Not what I was hoping to hear, but thanks for the advice. I'm going to take it in for a tune up and see if they will dial in the pump for me, without charging me up the a$$,
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Unread 05-23-2009   #9 (permalink)
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Quote:
Originally Posted by Rocketburn11 View Post
Not what I was hoping to hear, but thanks for the advice. I'm going to take it in for a tune up and see if they will dial in the pump for me, without charging me up the a$$,

Pull the codes first.
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Unread 05-23-2009   #10 (permalink)
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Quote:
Originally Posted by jaja6009 View Post
is your trick to mash the top of the regulator down to increase pressure? That was one of mine.
Quote:
Originally Posted by 89coupe View Post
ha ive been busted. Its an old mechanics trick, but it does work as far as raising fuel pressure a tad.


ha ha ha ha.......
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Unread 05-23-2009   #11 (permalink)
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Ill never make it as a criminal
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Unread 05-24-2009   #12 (permalink)
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I just tested my fuel pressure and at idle with vacuum line on it was 32 with vacuum line off it was 40 with full vacuum applied it was 30. Stock pump and reg.

My car would die when I let off on the gas when I tryed to drive it with the speedo cabel unhooked.
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