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post #1 of 6 (permalink) Old 08-15-2019, 07:29 PM Thread Starter
 
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I'm new to the forum.

Hello everybody, I have 2007.5 LMM Crew Cab 4wd with 176k miles . I live in Arizona where is is hotter than hell. Lately when the temp exceeds 116 degrees, my truck won't restart after I have been driving it for a while. After it cools down a bit and I prime it, it'll start.. For the most part. I've been reading some of the forums that say the culprit might be the filter housing O rings, but I have not been able to find a post that says whether that was the fix or not. Please help this Newby out. Thanks! Martin
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post #2 of 6 (permalink) Old 08-15-2019, 08:00 PM
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Welcome to the forum.

This is a well known problem. The rubber parts in the primer pump get old and leak. Since it is under vacuum it leaks air in rather than fuel out. When air gets in it prevents it from starting. This isn't directly a heat related issue but temperature extremes can exacerbate it.

There are several courses of action. You can replace the filter head with a new one that comes with a new filter and water sensor for about $110. You can do just the filter head for about $85. You can rebuild the pump yourself using a kit for about $25. You can install a lift pump which will change the air leak into a fuel leak which isn't a good thing but it won't strand you. That costs $200 on up to about $2000 depending on who you listen to.

There is another possibility. There are rubber hoses in sections of the fuel line that get old and collapse under vacum when they are hot and soft. These can be replace with ordinary bio-compatible fuel hose for just a few dollars.

There is a lot of info on both of these maintenance items all over this forum if you would care to look for it. I'm answering you here because you are new to the DF and perhaps you are also new to forums in general. It is polite to do a bit of looking first before asking questions that have been asked many times before.
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post #3 of 6 (permalink) Old 08-16-2019, 03:25 AM
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post #4 of 6 (permalink) Old 08-16-2019, 06:47 AM
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Welcome to the DF!

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post #5 of 6 (permalink) Old 08-16-2019, 09:44 AM Thread Starter
 
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Thanks to all. I appreciate the information! I think I'm just gonna replace the fuel filter head and hope that fixes the issue. I've inspected all my fuel hoses and they seem to be fine.
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post #6 of 6 (permalink) Old 08-16-2019, 10:49 AM
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Quote:
Originally Posted by Mags7 View Post
Thanks to all. I appreciate the information! I think I'm just gonna replace the fuel filter head and hope that fixes the issue. I've inspected all my fuel hoses and they seem to be fine.
Welcome to the forum, Mizterwizard hit it right on the nose... known issue !!

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