Vapor Lock Please Help
08-12-2012, 02:41 PM
#1
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Vapor Lock Please Help
I have an 84 Z-28 and I am having a vapor lock issue. It has a 350 bored .30 over and a mild cam. it has a mechanical fuel pump. the car is vapor locking on me and i cannot figure out how to fix it. it doesnt happen all the time but it will every once in a while. the little glass fuel filter was showing nothing but bubbles!! Its pretty bad and any input would be nice.
08-12-2012, 06:34 PM
#3
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Car: 84 Z28, '15 Colorado
Engine: L69
Transmission: A4
Axle/Gears: 3.73
Re: Vapor Lock Please Help
The factory setup uses a return fuel pump. That right there should have the problem fixed.
If that doesn't your next step would be to add a small spacer between the carb and intake.
If that doesn't your next step would be to add a small spacer between the carb and intake.
08-12-2012, 06:56 PM
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Car: 1987 IROC-Z Z28
Engine: L98
Transmission: T56
Axle/Gears: 3.70 9 bolt
Re: Vapor Lock Please Help
Do away with the mechanical fuel pump and install an electric low pressure in line fuel pump
08-12-2012, 06:57 PM
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Car: 1987 IROC-Z Z28
Engine: L98
Transmission: T56
Axle/Gears: 3.70 9 bolt
Re: Vapor Lock Please Help
You can get a fuel pump block off plate to replace your pump
08-12-2012, 10:32 PM
#6
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Re: Vapor Lock Please Help
I'm assuming you have a carb because of the mechanical fuel pump, yes?
You need to confirm two things before doing anything else.
1. Fuel pump pressure - should be around 8psi or thereabouts.
2. Fuel pump volume - should fill a pint can in about 30 seconds at idle.
Check your service manual for the actual test specs.
You need to confirm two things before doing anything else.
1. Fuel pump pressure - should be around 8psi or thereabouts.
2. Fuel pump volume - should fill a pint can in about 30 seconds at idle.
Check your service manual for the actual test specs.
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