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09-06-2013, 10:09 AM | #1 |
Member
Join Date: May 2010
Location: near Ft Worth, Texas
Posts: 63
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1969 F100 Fuel bowl leak down
I am posting this for ideas on WHY my carburetor bowl “leaks down” when the engine is HOT.
Specifics: 1969 F100 360 V8 Auto Trans (I am the original owner) 2100D 2 bbl carb manual choke (Original Carb) Cold starting: excellent…never fails to immediately start Hot starting: excellent if re-started within 3-4 minutes Hot starting: poorer & poorer if re-started after 5 minutes During the past year have installed TWO carb kits and THREE power values and the problem (leak down) continues. I can place the carb on the workbench, fill the bowl with gas and the full level remains for several days. So the problem seems to be “heat” but I simply cannot pin point the specific cause of the “leak down”. The fuel level will drop close to ½” within an hour but NEVER goes dry. Thoughts? |
09-06-2013, 11:20 AM | #2 |
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Join Date: May 2010
Location: capemaynewjersey
Posts: 653
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Re: 1969 F100 Fuel bowl leak down
Place spacer betin carb and manifold not matal somthing that will not attackmanifold heat
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09-06-2013, 06:17 PM | #3 |
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Join Date: Oct 2012
Location: oroville calif.
Posts: 1,453
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Re: 1969 F100 Fuel bowl leak down
billwill has the right idea, the carb is getting hot and boiling fuel out of the carb, flooding engine and leaving carb empty, thus hard starting, put a spacer at least 3/4" thick between the carb and manifold, dont use an aluminum or hard plastic one, find a spacer that is made out of compressed fiber, they dont transfer as much heat, if your using an aluminum manifold that is one problem, cast iron work better, and this new gas with alcohol doesnt help , it boils at a lower temp
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09-06-2013, 06:46 PM | #4 |
Senior Member
Join Date: May 2010
Location: St. Michael, Minnesota
Posts: 1,713
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Re: 1969 F100 Fuel bowl leak down
Many of the 360's had a spacer from the factory that was a source of vacuum for the PCV. The spacers would corrode, causing an idle problem. Since you didn't mention that, you may have the only one that hasn't corroded yet. There were some phenolic spacers available that had the vacuum hose barb on the back. Look for one of those. I don't know if they were aftermarket or factory for one year. If you have a vacuum source on the carb, you can make a spacer out of hard wood.
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10-02-2013, 08:27 PM | #5 |
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Join Date: May 2010
Location: near Ft Worth, Texas
Posts: 63
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Re: 1969 F100 Fuel bowl leak down
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Well worth the time...appreciate the advice. NOW...now does anyone need a C7AE-9A589-A, original 44 year old heated carb spacer? From my recent experience I would put them in the recycle bin. |
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