1969 Camaro fuel flow issues - Team Camaro Tech
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post #1 of 7 (permalink) Old Jun 15th, 12, 10:35 PM Thread Starter
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1969 Camaro fuel flow issues

I have a perplexing issue.
69 factory gas tank, running electric fuel pump and running into an issue of no fuel pressure. Take the line off and no fuel comes out. Blow an air hose into the tank "blowing backwards into tank", and then it will flow.

Cannot figure out why it is doing this.

Thoughts??
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post #2 of 7 (permalink) Old Jun 16th, 12, 01:22 AM
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Re: 1969 Camaro fuel flow issues

Where is the pump mounted? Most have to be mounted as close to the tank as possible and at or below the lowest point of the tank in order to self prime.

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post #3 of 7 (permalink) Old Jun 16th, 12, 07:26 AM Thread Starter
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Re: 1969 Camaro fuel flow issues

Mounted directly in front of tank, over axle, and just below lowest point of tank.

But my question is why will the fuel not ever run out of the line when not attached to pump? Have to blow air back into tank to get it to flow again.
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post #4 of 7 (permalink) Old Jun 16th, 12, 07:44 AM
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Re: 1969 Camaro fuel flow issues

What pump is it? Is it possible the pump is running backwards? Easy to check. Hook tank feed back up to pump. Run a temp hose from the pump outlet into your gas jug and submerge it. Remove gas cap from tank and put power on the pump. Check for bubbles in the gas jug.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #5 of 7 (permalink) Old Jun 16th, 12, 08:52 AM
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Re: 1969 Camaro fuel flow issues

May sound stupid but have you ever dropped the tank removed the sender and looked for debris? Maybe plastic or something similar is in the 43 years old tank, and is being pulled to the pump, blocking it. You reverse pressure it gets blown to the other side of the thank, pump pulls it back til it blocks the inlet to the pump.


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post #6 of 7 (permalink) Old Jun 17th, 12, 08:02 AM Thread Starter
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Re: 1969 Camaro fuel flow issues

Well we determined there was no blockage, just seems to be a siphoning issue with the way the line was ran.

Thanks for the help!

Now I have a new issue. I think it is temperature related, as the braided fuel line is up to 160-175 F at the carb.

I am getting interment issue of fuel puking up the vent tube on the carburetor, flooding the car & actually putting gas into the air breather.

Due to where we had to mount the aero motive internally regulated fuel pump, the exhaust pipe radiant heat has the fuel line at 130 at the rear of car. Pump is also at that temp.

Going to put some heat deflector on exhaust to try and block that point of exposure, as well as putting fuel line inside DEI heat sheath.

Any other ideas or thoughts??
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post #7 of 7 (permalink) Old Jun 17th, 12, 09:38 AM Thread Starter
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Re: 1969 Camaro fuel flow issues

Aeromotive internally regulated fuel pump.
Proform aluminum carb 850
Holley aluminum carb heat shield
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