Vapor Lock - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 7 (permalink) Old 08-30-2009, 07:00 PM Thread Starter
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Vapor Lock

Ok, I think I've posted before on this issue, but I'm going trolling again for more info.

Pulled my trailer back home today, air temp 105, flat haul. Truck running fine, kept it at 55mph as I was trying to see how high I could get the MPG while towing. Got it to 10mpg.

Anyhoo' , I got home, let the motor idle for 2 minutes and shut down. Emptied the trailer, about 1 hour, then went to start and take the trailer to storage. Engine started fine, idled long enough for the air conditioner to start blowing hard and then the motor quit. Just like it ran out of gas.

Tried to start and nothing! Crank and crank, nothing.

Went to prime and noticed two thing: 1. Priming plunger was fairly squishy, I'm assuming no fuel or at least vapor only. 2. After pumping 4-5 times, fuel started oozing from the area of the plunger where the triangular flange holds the plunger down to the fuel manager.

I assume this is not supposed to happen and is probably the reason why I'm losing prime when it gets hot out.

I've called the dealer to see if the plunger itself is serviceable and it is not, have to r/r the entire fuel manager which is unacceptable to me.

Has anybody rebuilt the seal on the plunger? If so, what problems will I have to overcome to be successful?


Mike Paul
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post #2 of 7 (permalink) Old 08-30-2009, 07:27 PM
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These truck don't usually vapor lock, because the fuel does not get hot enough to vaporize in the line.

Yes, it sounds like the filter housing needs to be replaced-- I have seen them -new and rebuilt on eBay.

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post #3 of 7 (permalink) Old 07-26-2011, 02:29 PM
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this happened to me the other night .. had to get a tow home cause I did not know what to do to get it started .... what did you end up doing to solve the problem ?

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post #4 of 7 (permalink) Old 07-26-2011, 02:35 PM
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There is a vendor on here that sells a rebuild kit for the filter head

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post #5 of 7 (permalink) Old 07-30-2011, 04:32 PM
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I am haveing the same problem. I have to pop the hood and prime the system about every other day to get the truck started. Once i get it started, I rev it to about 2,000 rpms for a couple minutes and everything is fine for a couple of days. Of course it happens at the damndest times.
What vender is selling them?

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post #6 of 7 (permalink) Old 07-30-2011, 04:36 PM
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Filter Heads & Rebuilds : DMAXSTORE.COM, Your Duramax Diesel-Only Shopping Resource

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post #7 of 7 (permalink) Old 08-01-2011, 10:32 PM Thread Starter
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I ended my problems for less than $150 at GM Parts Direct: Your direct source for Genuine GM Parts, it too me maybe 45 min to install a new filter housing. No problem since.
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