Fuel pressure test

CAMP.

MEMBER
2008 SATURN AURA
3.6L
V6
FWD
150,000 MILES

Well, I did a fuel pressure test on my car, the test showed with the car not running, but with cycling the key on and off, the pressure some where around 50 - 53 pounds of pressure. Okay, with the car running the pressure still reading at the same reading, but my needle on the gauge begins fluctuating rapidly between 49 - 53 pounds a pressure, and with the car off the pressure drops from 53 pounds a pressure to 29 pounds ps. With in three minutes. Can you please help me out and steer me in the right direction? Thank you

6 Replies

STEVE W.

MECHANIC
13,452 POSTS

What was the reason you did the pressure test? No start, hard starting?

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Tuesday, January 17th, 2017 AT 9:29 AM

CAMP.

MEMBER
21 POSTS

Car had a really bad mis and shake.

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Tuesday, January 17th, 2017 AT 9:32 AM

CAMP.

MEMBER
21 POSTS

Found a bad coil of plug was causing the the problem, but what got me is the fuel pressure test. The car running good after I swapped out coil wire, but the fuel pressure test that is another story.

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Tuesday, January 17th, 2017 AT 9:38 AM

CAMP.

MEMBER
21 POSTS

One more thing, the car runs good like I was saying, but after it gets nice an hot say I drove and got gas, if I cut the car off and filled up with gas it take hard time to start. Now, If I get gas and leave the car running when I remove the gas top the car begins missing badly and check engine light comes on.

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Tuesday, January 17th, 2017 AT 9:44 AM

STEVE W.

MECHANIC
13,452 POSTS

Check the EVAP purge solenoid, you'll probable find it's sticking open.
Will cause both issues as the engine is seeing a vacuum leak with it open. And the hard starting is because you filled it and the purge system starts drawing in a lot of extra fuel vapor through the port.