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Old 05-11-2013, 07:03 PM   #1
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Fuel Pressure Readings

I just want some opinions on the fuel pressure readings I have. When I turn the key to on position it goes to 50 then drops to about 46. Idle is 40 and when I drive and coast its at 38.

Also the gauge acted weird one time a day ago... The needle spiked to 100 and moved between that and 70 before tuning to normal. Today when I pushed in my clutch it jumped to 80 and fell back to 40.
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Old 05-11-2013, 08:08 PM   #2
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What fuel pressure gauge?
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Old 05-11-2013, 08:52 PM   #3
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Just an aftermarket one I have from glowshift
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Old 05-11-2013, 10:18 PM   #4
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What year car?
Fuel pressure is different depending on the year.
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Old 05-11-2013, 11:20 PM   #5
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Quote:
Originally Posted by NavyVet View Post
What year car?
Fuel pressure is different depending on the year.
1999 3.8 series II
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Old 05-12-2013, 10:50 AM   #6
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Just wanted to know if they were normal readings
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Old 05-12-2013, 11:01 AM   #7
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Don't sound normal to me.
Sounds like the fuel pressure regulator might be failing.
Driving it is supposed to be 40 to 46 psi IIRC.
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Old 05-15-2013, 09:21 AM   #8
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Ugh, that's something I really didn't want to replace.. there us no gas in the vacuum line coming of the fuel pressure regulator though
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Old 05-15-2013, 09:54 AM   #9
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How accurate is your "aftermarket" gauge?
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Old 05-15-2013, 10:38 AM   #10
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Quote:
Originally Posted by NavyVet View Post
How accurate is your "aftermarket" gauge?
I believe its fairly accurate. The readings were much better when I had first put the gauge in.
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Old 05-15-2013, 10:52 AM   #11
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Quote:
Originally Posted by tylersmif View Post
I believe its fairly accurate. The readings were much better when I had first put the gauge in.
The only way to be sure is to compare it to a direct reading mechanical gauge.
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Old 05-15-2013, 12:46 PM   #12
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Quote:
Originally Posted by NavyVet View Post

The only way to be sure is to compare it to a direct reading mechanical gauge.
This... But the readings you are describing aren't right at all. If the pressure drops when the pump shuts off after it primes that's generally a sign the check valve in the pump is failing.
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Old 05-15-2013, 01:03 PM   #13
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Quote:
Originally Posted by 94 T/A View Post

This... But the readings you are describing aren't right at all. If the pressure drops when the pump shuts off after it primes that's generally a sign the check valve in the pump is failing.
What do you guys suggest I do? Wait a little and see what happens?
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Old 05-15-2013, 04:14 PM   #14
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Quote:
Originally Posted by NavyVet View Post

The only way to be sure is to compare it to a direct reading mechanical gauge.
Get one of these (you might be able to rent them) and verify the pressure your gauge reads is the true pressure.
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