Bubbles in fuel normal? - Pontiac GTO Forum
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post #1 of 15 (permalink) Old 09-10-2011, 09:19 PM Thread Starter
 
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Bubbles in fuel normal?

Hi all,
Took the 66 out today and had to get gas, it was just under half tank. Turns out they were out of 93 so I had to go to another station. This car is a PITA to restart. I was a good 10 minutes trying to get it fired again. I finally popped the hood and checked all my connections. While wiggling the fuel line I noticed some bubbles in the fuel filter, didn't think much of it at the time. So I go to the next station, fill up and again, can't keep it running. The first crank it will fire, I can run it for 10 seconds or so, then it just dies. So I try one more time and it won't fire. Then I get to thinking about those bubbles. So I pop the hood and wiggle the fuel lines again, a bunch of bubbles appear in the filter. I keep wiggling until no more bubbles appear. Then she fires right up. SO I get it home, immediately pop the hood and the fuel in the filter is bubbling like crazy. Wiggling the lines makes more bubbles appear.

So is this bubbling normal or is it air in the lines? Can this be coming from a leaky seal back by the tank? Or should I be looking else were?

Temp was only 80* Car was around 200* at the time of restart.


Thanks
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post #2 of 15 (permalink) Old 09-10-2011, 09:28 PM
 
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hey Batman, may be from the rubber lines in your fuel system having micrscopic cracks bleeding air in under pressure i would replace all the rubber lines (there is a small section at the tank sending unit also).
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post #3 of 15 (permalink) Old 09-10-2011, 09:32 PM
 
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Sounds like your fuel pump is sucking air, and loosing its prime and your float bowls are running dry. Do you know what kind of fuel pump you have, electric or mechanical? Either one could have a bad hose or cracked hard line somewhere between it and the tank.

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post #4 of 15 (permalink) Old 09-10-2011, 09:39 PM Thread Starter
 
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Nice to see you around again Brian, you must be slammed with work!

I have an electric pump from summit racing.

So the bubbles are not normal, all I needed to know. Most the fuel line looks brand new. But there are a few sections where there is old rubber hose, right by the filter.

In this pic you can see the blue line, those are beefy and look new.


This pic you can see the old rubber hose I speak of.
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post #5 of 15 (permalink) Old 09-10-2011, 09:51 PM
 
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Is that your fuel pump sitting right behind the filter, or is that a fuel pressure regulator? If it's your pump, the location may be part of the problem. Fuel pumps are pushers, not pullers. Your pump needs to be low and in the rear of the car near the tank to work properly.If that's a regulator, that may be the source of the air.

Just a thought

Chuck

When the only tool in your toolbox is a hammer, you tend to see every problem as a nail.
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post #6 of 15 (permalink) Old 09-10-2011, 10:50 PM Thread Starter
 
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Yeah, pumps back at the tank.
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post #7 of 15 (permalink) Old 09-11-2011, 07:21 AM
 
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Bat, It could be a loose line at a clamp, or a defective filter. Go over all your clamps and lines...first things first. Also, check the little filter that is in the carb, where the fuel line goes in....E



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post #8 of 15 (permalink) Old 09-11-2011, 11:19 AM
 
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could be fuel percolation \ vaporizing as well.
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post #9 of 15 (permalink) Old 09-12-2011, 10:30 PM
 
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Start by changing out that nasty filter and feed lines. It may be clogged, if not, it's old. May be a simple fix.
Very nice looking motor!

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post #10 of 15 (permalink) Old 09-12-2011, 10:46 PM Thread Starter
 
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Any idea what brand that is (I couldn't find it on Summit or Jegs)? I like the idea of the glass, do you have a better recommendation? Do you mean change all lines from the regulator to the carb?

Thanks!
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