fuel pump not priming
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Junior Member
Joined: Jul 2014
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fuel pump not priming
Please help!! I have an 87 iroc-z with a 350 ramjet crate motor that now has 7000 km on it. I turn my key on and fuel pump does not prime and wont start. Next day I do it again and it primes and fires up perfect. Another day later fuel pump does not prime again and wont start. Now today it primes and starts again. My thoughts are fuel pump relay or fuel pump starting to go. I dont want to replace everything. Any help?
Last edited by yroc33; Jul 17, 2014 at 08:15 PM. Reason: added year and motor details
Joined: Aug 2011
Posts: 661
Likes: 7
From: Texas
Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Re: fuel pump not priming
Relay is the easiest to replace and find out whether it continues with intermittent starts. I hope that's it, but if the fuel pump hasn't been changed out on an '87 it's probably getting ready to die. Good luck.
Senior Member
Joined: Nov 2000
Posts: 762
Likes: 2
From: Riverside, CA
Car: 1987 Camaro IROC-Z
Engine: 305TPI
Transmission: 700R4
Re: fuel pump not priming
Search is your friend.
Check resistance of the pump during the no-start condition. Could be heat-soak on the pump. Could be a bad relay.
Check resistance of the pump during the no-start condition. Could be heat-soak on the pump. Could be a bad relay.
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Fuel 4 Thot
This quick-to-build assembly will tell you.
Grab a piece of sheet metal, drill a few holes, mount a few LEDs and you’re good-2-go.
You can use LEDs with built-in resistors so they’re ready to use with 12 volts.
Wire A — Connect to pin A of the pump relay.
Wire D — Connect to pin D of the pump relay.
Wire E — Connect to pin E of the pump relay.
Wire P — Connect at the pump.
Mount the panel in the cockpit.
Double-sided tape will work because it’s a temporary panel.
Now, when the problem occurs, you merely have to glance at the panel to see where the problem is.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
I Didn’t Jump The Start, The Flagman Was Late
Grab a piece of sheet metal, drill a few holes, mount a few LEDs and you’re good-2-go.
You can use LEDs with built-in resistors so they’re ready to use with 12 volts.
Wire A — Connect to pin A of the pump relay.
Wire D — Connect to pin D of the pump relay.
Wire E — Connect to pin E of the pump relay.
Wire P — Connect at the pump.
Mount the panel in the cockpit.
Double-sided tape will work because it’s a temporary panel.
Now, when the problem occurs, you merely have to glance at the panel to see where the problem is.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
I Didn’t Jump The Start, The Flagman Was Late
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