78z only starts sometimes

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10-09-2011, 03:21 PM

1995buick

Registered User

Thread Starter

Join Date: Oct 2011

Posts: 1

78z only starts sometimes

Hi there,
I recently purchased a 78 280z. The fuel pump does not want to run when the car is being turned over but when wired directly to the battery it will pump gas. It will start once and a while and purr like a kitten but its very anoyying when the pump decides not to run. Any help would be great.

thank you

10-09-2011, 04:39 PM

NismoPick

The Good Twin

Join Date: Aug 2005

Location: Wild Wild West, UTAH!

Posts: 20,639

Welcome to ZDriver!

Start by checking (replacing) the fuel pump relay and wiring / connections. Also, download the FSM at www.xenons30.com/reference

10-09-2011, 05:11 PM

Nismopu

Registered User

Join Date: Oct 2011

Location: Woodland, WA

Posts: 19

The AFM activates the fuel pump on these cars so, I would check the connection on the afm itself. It helped me get my 76 running some years back.

10-10-2011, 02:03 PM

theramz

I have a present for you...

Join Date: Mar 2003

Location: dayton, nevada usa

Posts: 1,691

Quote:

Originally Posted by Nismopu

The AFM activates the fuel pump on these cars so, I would check the connection on the afm itself. It helped me get my 76 running some years back.

On the '78 cars the fuel pump is wired through the oil pressure switch not the AFM. Check your wiring at the oil pressure sender switch, it could be bad.