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by **inluxhvn** on Sun, 13 Apr 2014 6:57 +0000

My fuel pump doesn't turn off with the key. It's a 3.8 Buick conversion can anyone point me in the write direction. Faulty relay sticky ignition switch ?

by **mattwhite** on Sun, 13 Apr 2014 7:43 +0000

Sticking relay most likely. Ignition would leave everything powered up.

by **inluxhvn** on Sun, 13 Apr 2014 7:44 +0000

Cheers what happens if they never ran a relay ?

by **boxhead55** on Sun, 13 Apr 2014 7:45 +0000

The fuel pump is controlled by the oil pressure switch. On the 3.8
Disconnect the oil pressure switch and see if it turns off. If so replace the switch.

by **mattwhite** on Mon, 14 Apr 2014 10:13 +0000

I agree but I think you'll find the key still overrides that circuit through the efi relay. Been a bit since I mucked around with the old girls and I could be wrong. Happened once. :lol:

If there's no relay in the circuit you'd overload the ecu. It's not designed to handle enough current to run the pump. Just the relay. Is it ecotec? Any idea on the commodore model?

by **inluxhvn** on Mon, 14 Apr 2014 6:24 +0000

Series 1 Buick engine matt

by **inluxhvn** on Tue, 15 Apr 2014 3:43 +0000

Fix they didn't run a relay

by **mattwhite** on Tue, 15 Apr 2014 6:35 +0000

Oh lol ok. Sorry mate, missed yesterday's post. So what was the fix?

by **benlux10** on Tue, 15 Apr 2014 8:26 +0000

I've came across same problem with pressure switch. But it was the engine holding oil pressure on switch.

by **inluxhvn** on Wed, 16 Apr 2014 7:30 +0000

They didn't run a relay and other parts weren't hooked up :/

by **mattwhite** on Wed, 16 Apr 2014 10:05 +0000

Yeah, that'll do it.

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