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05-12-2018, 08:59 PM | #1 |
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Join Date: May 2010
Location: Southern Illinois
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Fuel boiling at fuel pump
I drove my 47 tudor today on the first really hot day of the year. Outside temperature was 90. My engine temp never got above 180. I experienced vapor lock so severe my electric pump would not clear it out. When I opened the hood I could hear gas sizzling, popping and bubbles in the sediment bowl. I run a phenolic spacer on the carburetor. I believe the vapor lock to be at the pump. 89 octane pump gas. What do I do about this problem?
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05-13-2018, 12:28 AM | #2 |
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Location: Reno Nevada
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Re: Fuel boiling at fuel pump
I had the same issue till I installed a adjustable electric fuel pump , Made adjustments till I was able to achieve enough pressure to overcome vapor locking .
Vic |
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05-13-2018, 03:17 PM | #3 | |
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Re: Fuel boiling at fuel pump
Quote:
Vic: Could you help us ALL out, and publish the make and model of the "adjustable fuel pump". We are all entering the same time of year that "vapor lock" seems to be prevalent. Thanks
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05-13-2018, 01:22 AM | #4 |
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Location: Spalding, United Kingdom
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Re: Fuel boiling at fuel pump
My fuel line used to run along the chassis adjacent to the exhaust - fuel came out near boiling at the pump. Line now runs along the driveshaft tunnel - problem solved
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05-13-2018, 07:15 AM | #5 |
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Location: Southern Illinois
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Re: Fuel boiling at fuel pump
The car and engine is all stock except dual exhaust. I'll insulate the fuel line from the tank to mechanical pump and see if this helps.
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05-13-2018, 07:48 AM | #6 |
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Re: Fuel boiling at fuel pump
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Good luck...Dick. |
05-13-2018, 08:24 AM | #7 |
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Re: Fuel boiling at fuel pump
Was there any corn in that fuel?
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05-13-2018, 11:52 AM | #8 |
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Location: Southern Illinois
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Re: Fuel boiling at fuel pump
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05-13-2018, 12:35 PM | #9 |
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Re: Fuel boiling at fuel pump
Hi Seth, No help here sadly. Any time I've had the issue I used cold rags applied to FP and lines under hood, combined with waiting.
I hope I don't take this off track here. But I'm curious under what conditions the '47 quit running? Were you driving at the time, or had you stopped and turned it off, and the issue happened when restarting?
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05-14-2018, 09:10 AM | #10 | |
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Location: Southern Illinois
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Re: Fuel boiling at fuel pump
Quote:
It was a lot of "city" driving. Stop and Go. I had stopped at Alex's house to assist him with his '35 tudor. When I fired it back up after a half hour of sitting I made it a 1/4 mile and she was locked up tight. |
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05-13-2018, 03:08 PM | #11 |
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Location: Near Rising Sun, Maryland
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Re: Fuel boiling at fuel pump
Seth, I have the same issue on my 35 fordor when ambient temperature is in the 90-100° range, and my car stops moving. I'm using a '47-'48 glass bowl fuel pump, and the glass bowl is located very close to the left side head and intake deck. This area seems to be out of the normal airflow, and more prone to being in a heat pocket. At times I can see the alcohol boiling/bubbling inside the glass bowl. This causes a pressure buildup in the gas line, most likely both to and from the fuel pump, which stops the gas flow. I can overcome this quickly by placing a rag soaked in ice water directly on top of the fuel pump and the gas lines coming into and out of the fuel pump. 2-3 minutes of this and the engine will restart and I'm on my way. One thought I had to overcome this problem would be to make a 1" aluminum spacer, that would locate between the pump and intake manifold, and change to the longer FP rod. This would bring the fuel pump bowl 1" higher from the heated engine, and possibly more inline with the air flow. In addition, maybe add a heat shield between the bowl and engine, or come up with some method to direct cooler air on the fuel pump and glass bowl. Some of these ideas came from G.M./George Mitchell's experimentation and testing done several years ago.
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05-13-2018, 08:02 PM | #12 |
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Location: Bristol, WI
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Re: Fuel boiling at fuel pump
An old trick - though not exactly permanent - was to put a wooden clothes pin on the fuel line, as it, in theory, sucks some of the heat out of the fuel and allows for it to remain somewhat cooler.
Not exactly permanent, but not entirely bogus, either. But it IS just about the cheapest fix you'll find!
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05-13-2018, 08:27 PM | #13 |
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Location: 36 miles north of Albany NY
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Re: Fuel boiling at fuel pump
I siphoned the ethanol blend from my tank and put non-ethanol in, I am lucky to have two stations that sell non-ethanol within two miles of me.
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05-13-2018, 09:30 PM | #14 | |
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Re: Fuel boiling at fuel pump
Quote:
Old wives tale.
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Life is like a roll of toilet paper. The closer to the end, the faster it goes. It is better to be seen, than viewed. "We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm". |
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05-13-2018, 09:04 PM | #15 |
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Re: Fuel boiling at fuel pump
Seth
Install an electric pump inline near the tank. Make up a return line to the tank with a pressure regulator from a tee between the mech. pump and carb. The recycling fuel will be less prone to boil. None of this is original or stock, but may work. Bruce
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05-14-2018, 07:28 AM | #16 |
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Re: Fuel boiling at fuel pump
My old wife said the clothes pin worked because it altered the airflow pattern and created a alternating low and high pressure system vortex that brought in an arctic air mass from the north and kept the fuel line cool.
You tell her she's wrong....I dare ya! |
05-14-2018, 09:01 AM | #17 |
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Re: Fuel boiling at fuel pump
Does Illinois even sell gas without corn???
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05-14-2018, 10:46 AM | #18 |
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Re: Fuel boiling at fuel pump
JT- Here in NW Illinois non-ethanol is pretty readily available. On most pumps, the 87 and 89 will say "10% ethanol added" and the highest octane (91 or 93) will either say "no alcohol added" or just say nothing. Not sure what the availability is down south where Seth is.
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05-14-2018, 12:58 PM | #19 | |
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Re: Fuel boiling at fuel pump
Quote:
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05-14-2018, 01:27 PM | #20 | |
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Join Date: Sep 2016
Location: Geneseo, IL
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Re: Fuel boiling at fuel pump
Quote:
Bummer. I guess that's one advantage of N IL. (Another being a few degrees cooler) ;-)
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