fuel pump relay
Thread Starter
Intermediate
Joined: May 2006
Posts: 38
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From: Gilbert Az
fuel pump relay
1989 vette trying to find the fuel pump relay? Could someone point me in the right direction. When I turn key to on position only and car not running.I get no biuld-up of fuel pressure. Is this normal?
Le Mans Master
Joined: Jan 2003
Posts: 5,858
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From: Santa Maria CA
Originally Posted by wjmac40
When I turn key to on position only and car not running.I get no biuld-up of fuel pressure. Is this normal?
Is the car starting?
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Originally Posted by wjmac40
1989 vette trying to find the fuel pump relay? Could someone point me in the right direction. When I turn key to on position only and car not running.I get no biuld-up of fuel pressure. Is this normal?
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
That's because the fuel pump relay is inop. Once you start cranking and the oil pressure reaches about 4 psi, the oil pressure switch (backup to the fp relay) runs the fuel pump. It will start the engine, just take longer.
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
If you have a manual transmission, you might have two relays there instead of one. I know that on the early TPIs with manual trans, both relays are the same part number and monted next to each other. One for the fuel pump, and one for the overdrive. If your '89 is like this too, you should be able to swap relays and test your suspicisions using your fuel guage.
