Vaour lock and wrapping fuel lines - Team Camaro Tech
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post #1 of 11 (permalink) Old May 30th, 02, 01:19 PM Thread Starter
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Mike
 
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I am experiencing vapour lock that is making the car difficult to start when hot. I first thought it was the silinoid on the started BUT then "my brain farted" and reminded me that I relocated mine in the fender well and does not seem to be any turning over problem. It just takes me 10-15 secs to get the car to finally stumble, fart and finally start. (only when hot, on cold, start up right away)

Anyways, I was thinking of wrapping my 3/8" hose with that "cool tape" stuff. Will this work? I have about 6 feet sitting around and would not mind using it up. Otherwise, anything else better?

Any thoughts? Thanks!
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post #2 of 11 (permalink) Old May 31st, 02, 12:24 AM
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My gas line runs near a header tube. I used the line wrap from Summit. It's a split wrap that easily goes around the line. I think it's Cool Wrap but may be mistaken. It's by the mfg that offers header wrap, starter wraps, etc. A good upgrade since I didn't want to relocate the line.

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post #3 of 11 (permalink) Old May 31st, 02, 12:36 AM
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Vapor Lock........Haven't heard this one since the 70's. Kindda went away in the 80's with the introduction of EFI and pumps in the tank. Gas cap venting? Tank could be in a vacuum...

Yes, you can cover up the fuel line with thermal cloth, pipe insulation, an old trick was/is tin foil. All of these provide a heat shield for the metal fuel line. Another trick was to attach every four inches is a wooden clothes pin. One last trick is to replace the metal line with fuel hose, works well, but I'd use it as a last resort.

It might be worth while to troubleshoot the fuel pump, if mechanical. Check it for vacuum on intake side, and you might install a clear fuel filter to see if any bubbles are evident, as in a leak in the line from the tank to the pump. Clear filter should always be full of fuel.

If you believe the fuel system to be a problem, I would suggest installing an auxilary pump by the tank to assist the mechanical pump and/or install a return line back to the tank/"Y" into the tank outlet.

Well. maybe some others will chime in with their suggestions.....Good luck!!

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post #4 of 11 (permalink) Old May 31st, 02, 01:19 AM
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I would think that the bowls in the carb would have enough fuel in them to start the car when hot unless the fuel is being boiled away? Sitting still? And, wrapping fuel lines will not help the bowl issue?

Are you sure it's a fuel problem. Can you look down the carb and pump the accellerator and see fuel. If not, then the fuel is probably going away due to very high temps, and I would check that out or float levels being too low.

If the fuel is really boiling away, then I would seriously consider a themal barrier such as a plastic spacer.

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post #5 of 11 (permalink) Old May 31st, 02, 03:08 AM
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What type of carb is it. could be leaking down if its a q-jet

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post #6 of 11 (permalink) Old May 31st, 02, 09:52 AM Thread Starter
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<BLOCKQUOTE>quote:</font><HR>Originally posted by Milan:
What type of carb is it. could be leaking down if its a q-jet

<HR></BLOCKQUOTE>

Its a Holley 750 carb.
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post #7 of 11 (permalink) Old May 31st, 02, 10:10 AM Thread Starter
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<BLOCKQUOTE>quote:</font><HR>Originally posted by Everett#2390:
It might be worth while to troubleshoot the fuel pump, if mechanical. Check it for vacuum on intake side, and you might install a clear fuel filter to see if any bubbles are evident, as in a leak in the line from the tank to the pump. Clear filter should always be full of fuel.
<HR></BLOCKQUOTE>

I did install a clear fuel filter and it bubbles like crazy. I checked the gas cap and it a vented one, I replaced it with a NON vented and same thing, I removed the gas cap and same thing. I did install a new mechanical fuel pump over winter, BUT I can't really say if the problem started because of it. I also changed the intake, water pump, rad etc etc...

Is there an easy way to check for vacuum on the intake part of the fuel pump?

Thanks in advance.

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post #8 of 11 (permalink) Old May 31st, 02, 10:16 AM Thread Starter
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<BLOCKQUOTE>quote:</font><HR>Originally posted by HOTRODSRJ:
I would think that the bowls in the carb would have enough fuel in them to start the car when hot unless the fuel is being boiled away? Sitting still? And, wrapping fuel lines will not help the bowl issue?

Are you sure it's a fuel problem. Can you look down the carb and pump the accellerator and see fuel. If not, then the fuel is probably going away due to very high temps, and I would check that out or float levels being too low.

If the fuel is really boiling away, then I would seriously consider a themal barrier such as a plastic spacer.

<HR></BLOCKQUOTE>

If wrapping the fuel lines does not help, I plan to install an aluminum plate between the carb and the intake to shield the fuel bowls. It is certainly possible that the fuel could boil in the bowls. Just to NOTE this problem only occurs when the engine is HOT. When cold, it start right up.
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post #9 of 11 (permalink) Old Jun 10th, 02, 11:26 AM
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still got bubbles in filter? sounds like dry rotted rubber lines sucking air probably at the tank
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post #10 of 11 (permalink) Old Jun 11th, 02, 12:38 AM
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Mikestr,

To check for fuel pump vacuum, remove the incoming fuel line and substitute a vacuum gauge. Start engine, read gauge, s/b min of 10 in/H2O.

To check fuel line for leaks, connect shop air to incoming fuel line hose at fuel pump, disconnect fuel hose from tank and plug, adjust regulator for 10-15 psi, spray entire fuel line/hose with window cleaner/soapy solution/leak detector and check for bubbles. Find bubbles, fix leak(s).

Replace non-vented cap with vented cap.

Everett
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post #11 of 11 (permalink) Old Jun 12th, 02, 05:17 AM Thread Starter
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<BLOCKQUOTE>quote:</font><HR>Originally posted by storman:
still got bubbles in filter? sounds like dry rotted rubber lines sucking air probably at the tank<HR></BLOCKQUOTE>

These are new lines from the fuel pump. From the fuel pump to the tank are stainless steel, replaced about 8 years ago.
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