Fuel Pressure Problems - Team Camaro Tech
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post #1 of 5 (permalink) Old Sep 22nd, 12, 08:17 AM Thread Starter
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Fuel Pressure Problems

I recently installed a restored DZ Holley on my 69z28 (302). I got the carb from Phillip at Custom Rebuilt Carbs and he has been very helpful in helping to resolve my issue.

There is gas pouring out of the top vent of the primary bowl. I checked the needle and float and all is clean. I checked the fuel pressure and it was 8.5psi which Phillip told me is too much pressure and probably the reason the fuel is overflowing. The fuel pressure should be between 4-6psi I was told.

There was an aftermarket mechanical fuel pump on the car so I changed it to an OEM unit. I started the car and the problem was worse. I put the fuel pressure guage on there again and its over 10psi...wtf?

I'm starting to think that I need a fuel pressure regulator but I don't want to put one on...I just want this thing to work properly as originally intended.

Thoughts?
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post #2 of 5 (permalink) Old Sep 22nd, 12, 08:42 AM
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Re: Fuel Pressure Problems

Did you try lowering the float level? Dirt in the needle/seat will cause this, and so will a float level that's set too high. Sunk float is the other option.

Of course, 10 psi is too high, but if it's s stock replacement pump I'm thinking your gauge is off. You should be able to use a stock pump or any of the street mechanical pumps without a separate regulator.


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post #3 of 5 (permalink) Old Sep 22nd, 12, 09:57 AM
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Re: Fuel Pressure Problems

Right... a stock fuel pump should only give you 5-6psi.

Forget the gauge for now. Take the bowl(s) off and reset the float levels. Or lower them on the carb first, then take the site plug(s) out and adjust them until fuel is just barely dribbling out of the hole(s) when you shake the car.
If you take the plugs our right now and fuel is pouring out of the holes, the floats are WAY too high, or something is wrong with them.

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post #4 of 5 (permalink) Old Sep 23rd, 12, 09:44 AM Thread Starter
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Re: Fuel Pressure Problems

The problem was the float level. It was set to "factory" specs but needed to be lowered 2 full turns to get the level correct.

Someone on this forum once told me to check the simple things first. I should have done that in this case.

I'm learning but still a dummy...just a little less of a dummy now.
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post #5 of 5 (permalink) Old Sep 23rd, 12, 12:12 PM
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Re: Fuel Pressure Problems

No dummy ever learnt nuthin'.


I learned a long time ago to approach everything using the K.I.S.S. principle.
Glad it's fixed.

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