fluctuatuing/ bouncing fuel pressure guage

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Feb 2, 2010 | 04:49 PM

NicksZ

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Racer

Joined: Aug 2009

Posts: 271

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From: Folsom CA

fluctuatuing/ bouncing fuel pressure guage

I recently installed new FAST fuel rails including an Aeromotive fuel pressure guage on my '03 Z06. I used -6 for the feed off the factory rail and -8 for the crossover. I dont remember when I first installed it... but now the guage needle bounces around 55-60 psi at idle... I cant figure out why it is rapidly bouncing...

Any ideas? Could the guage be bad? Or just the oscillation of the fuel pump?

Feb 2, 2010 | 05:39 PM

FRCTony

Drifting

Joined: Mar 2005

Posts: 1,737

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From: Northern VA

Quote:

Originally Posted by NicksZ

Could be injectors opening/closing. I assume the pressure is stable when the engine is not running.

The factory rail does have a pulse damper...

Feb 2, 2010 | 05:44 PM

NicksZ

Thread Starter

Racer

Joined: Aug 2009

Posts: 271

Likes: 1

From: Folsom CA

yes... when the engine is not running, the guage is steady. The car runs fine too.... I just wouldnt have thought the needle would bounce around so much...

Feb 2, 2010 | 06:47 PM

FRCTony

Drifting

Joined: Mar 2005

Posts: 1,737

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From: Northern VA

Quote:

Originally Posted by NicksZ

yes... when the engine is not running, the guage is steady. The car runs fine too.... I just wouldnt have thought the needle would bounce around so much...

This is probably normal if you are using a mechanical gauge on the end of the rail. Maybe even with an electrical one if it is not damped.

I'm sure an expert will chime in soon.

Feb 2, 2010 | 07:01 PM

NicksZ

Thread Starter

Racer

Joined: Aug 2009

Posts: 271

Likes: 1

From: Folsom CA

Yup... it's a mechanical right on the end of the fuel rail....

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