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6.2L Diesel Engine Discuss the 6.2 GM diesel engine & associated components.

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Old 03-02-2016, 03:15 PM   #71 (permalink)
NCchevy
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I looked at it. It looks aftermarket honestly. Doesn't say gas or diesel on it. Doesn't say GM or acdelco. Plain black cap that says remove slowly. I opened it and it had a ton of pressure behind it. Should it be green or say diesel on the cap? Never knew there was a difference.

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Old 03-02-2016, 03:31 PM   #72 (permalink)
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Diesel fuel caps vent. If you had a ton of pressure when opening it, then the cap is not venting.

Excess pressure will keep the lift pump from being able to move fuel.

In the short term you can run the truck with the cap loose so the tank can vent.

You can get a Stant Diesel Fuel cap, part # Stant 10830D. Autozone has them in stock around here. $8.49 + tax.

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Old 03-02-2016, 03:35 PM   #73 (permalink)
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Really? I thought it had to seal to create a vacuum inside the system otherwise it would put air in the system. Hmm I'll give that a try then. But wouldn't it have acted up sooner than the 2 hours it took today?
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Old 03-02-2016, 03:41 PM   #74 (permalink)
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Not necessarily. Depends on how long it took to create the vacuum.

Excess vacuum is something we all know about and watch for. Just didn't occur to me to ask you the question early on

Loosen the cap and take it for a drive. Then check the fuel flow from the drain. If you get a steady flow after running the engine for awhile the vacuum issue could be the culprit.
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Old 03-02-2016, 03:42 PM   #75 (permalink)
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Slight vacuum is OK, loud "whoosh" vacuum is not. Extreme cases of excess vacuum have collapsed fuel tanks on these trucks.
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Old 03-02-2016, 03:47 PM   #76 (permalink)
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Lol when I checked the cap a few minutes ago it had a ton of pressure behind it when I unscrewed it. And I just went back there to loosin it and guess what... It had pressure behind it again and the truck hasn't been run all afternoon... Lol so maybe your right.

Kinda feel like I've gotten ahold of someone's basket case...
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Old 03-02-2016, 03:53 PM   #77 (permalink)
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Nope, you didn't ....cause my trucks is still sitting outside....

We'll get ya through this....
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Old 03-02-2016, 04:12 PM   #78 (permalink)
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Originally Posted by Freddyack View Post
Slight vacuum is OK, loud "whoosh" vacuum is not. Extreme cases of excess vacuum have collapsed fuel tanks on these trucks.
Holy crap really? Well mine was a huge whoosh! The cap is definitely newer than the truck. I've got it loose now and I will pick up a new cap tonight or tomorrow. Thanks for that info, that could've been bad :O
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Old 03-02-2016, 04:40 PM   #79 (permalink)
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Not to mention extreme vacuum can kill lift pumps.
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Old 03-02-2016, 04:45 PM   #80 (permalink)
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I was just reading an old thread on here about fuel caps. Does anyone know for sure which cap will actually vent off the pressure? After reading that thread it started to make sense. Someone said on gas engines it vent through the charcoal canister which is true. And diesels aren't hindered by emissions equipment so the cap needs to vent. So which one is a good cap to use?

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