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Old 04-26-2009, 04:58 PM   #1
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Default Vapor lock

How do I prevent vapor lock in my fuel lines? I never had this problem before until today. I got off the highway parked in a big hot parking lot under the sun went in the store came out 10 min. later and it started and sputtered and stalled so I cranked it a couple times with no response and figured instead of cranking it till my face turns blue how bout I open the hood and figure out whats the malfunction here. First thing I did was poke the schrader valve on the fuel rail and nothing but hot air came out at a high pressure so I'm like AH HA! so I turned the key in the ON position and purged all the air out and then I was on my way again.
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Old 04-26-2009, 05:37 PM   #2
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i get it out on the trail sometimes, it's cylinder 3 i believe. you can install some hood vents, which i cant speak to personally b/c i dont have them. of stack some small washers on the hinges in the back of the hood to raise it up a little bit.

but what i usually do, is when i stop on the trail, i just open the hood to let it cool. sometimes i'll leave it running for a couple mins so the fans keep goin or just turn it off and let it cool. or when your wheeling it, and everyone stops, just leave it running.
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Old 04-26-2009, 05:41 PM   #3
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This is gonna sound real redneck but I have heard allot of the old guys that my dad used to hang out with take wooden clothes pins and put them all down the fuel rail. I never said its something I would/have done but I have heard it works to help disapate the heat. I WILL STATE THIS ONE MORE TIME FOR THE DUMB *** WHO WANTS TO START FLAMING. IT IS WHAT THE OLD GUYS I USED TO TALK TO SAID TO DO.
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Old 04-26-2009, 07:12 PM   #4
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it sounds to me like your check ball in the fuel pump isnt holding pressure any more dumping the fuel back into the tank when the key isnt on. My cherokee does the same. normally i have to cycle the key a few times and wait. You can replace the pump assy or install a inline check valve.
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Old 04-26-2009, 07:16 PM   #5
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Thanks I think I might have a idea here. the thing is I don't want to cut any holes in the hood cause I want the stock look and it's lined up to the body perfectly. clothes pins? that's kinda out there but you never now till you try. or I can just deal with it and purge the fuel rail when I have the problem. Thanks for the opinions they help and I'll be looking for more.
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Old 04-26-2009, 07:24 PM   #6
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FYI opening the schrader valve on a hot motor isnt the best idea.
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Old 04-27-2009, 09:05 PM   #7
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Thats a good lead Thanks.I have to do the same thing cycle the key on off on off. And yea I know opening the valve on a hot motor isint a good idea. But thanks I'm gonna look at that.
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Old 02-25-2010, 12:28 AM   #8
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Vapor lock i didnt even think of that! I am having almost the same exact problem with mine. If I leave mine idle for about 10 minutes it starts running like *** and missing real bad and if I dont start moving again it shuts off, and when I do go under the hood there is a ridiculous amount of air in the line. I noticed changing the fuel pressure regulator helped too so I stocked up on those at the boneyard.
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Old 03-22-2010, 12:51 PM   #9
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Well with the weather getting warm again same spot "Home Depot" got vapor lock again I already replaced the pump and the fuel filter and regulator last year. any idea's? the heat shield is there on the manifold. You think the fiberglass mat under the hood could be helping the heat stay in there? I'm about to rip the thing out and maybe research hood vents that don't look stupid. What do you guys think? btw this is my stock XJ Trying to keep it factory like.
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Old 03-22-2010, 01:07 PM   #10
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clothes pins do work the wood will absorb the heat out of the metal fuel line. beleive it or not it does work. also you can put a little transmission fluid in with the gas it lowers the boiling point of the fuel.
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Old 03-22-2010, 01:19 PM   #11
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Quote:
Originally Posted by NAMBA860 View Post
also you can put a little transmission fluid in with the gas it lowers the boiling point of the fuel.
Lowering the boiling point would aggravate the condition. Then there is the smoke from the burning trans fluid issue. I wouldn't try this "remedy".
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Old 03-22-2010, 01:21 PM   #12
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Yea. I was iffy about that one
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Old 03-22-2010, 04:45 PM   #13
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bump
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Old 06-30-2010, 11:48 AM   #14
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Quote:
Originally Posted by JeepingDan View Post
How do I prevent vapor lock in my fuel lines? I never had this problem before until today. I got off the highway parked in a big hot parking lot under the sun went in the store came out 10 min. later and it started and sputtered and stalled so I cranked it a couple times with no response and figured instead of cranking it till my face turns blue how bout I open the hood and figure out whats the malfunction here. First thing I did was poke the schrader valve on the fuel rail and nothing but hot air came out at a high pressure so I'm like AH HA! so I turned the key in the ON position and purged all the air out and then I was on my way again.

I am having the same problem did you ever get your's fixed?
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Old 06-30-2010, 04:01 PM   #15
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Vapor lock is not an issue with a high pressure fuel injected fuel system. If it were a carb system, then vapor lock might be a problem, but not really.
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Old 06-30-2010, 04:01 PM
 
 
 
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