only 300 psi after a long drive, won't start

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Jun 20, 2013 | 10:49 AM

Spectramac

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From: Monroe, WA

only 300 psi after a long drive, won't start

I have this 05 with a high pressure issue. If you drive it for a half hour or more it only builds 300 pounds after a 10 minute soak and refuses to start. Must be a pretty small leak, cuz it always starts cold and will sometimes start hot after a looong crank. I've checked for a bad STC fitting and it's already been replaced. I'll be pulling the covers today to look around the injectors.

Jun 20, 2013 | 12:08 PM

mustang_309

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From: South Weber, Utah

Check if your truck has the updated standpipes and dummy plugs, if it doesn't that is probably the source of your leak. The way you can tell is the original standpipes and dummy plugs take a 10MM hex bit and the updated ones take a 12MM.

Jun 20, 2013 | 12:49 PM

big inch

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From: Jackson, TN

My money would be on dummy plugs.

Jun 20, 2013 | 02:50 PM

wrongway01

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Dummy plugs get my vote too.

Jun 20, 2013 | 05:52 PM

Spectramac

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From: Monroe, WA

Well, you guys called it. Pulled the right cover and took both plugs out. The lower ring on the dummy was shot. The other side can't look much better...

Jun 20, 2013 | 10:30 PM

Toreador_Diesel

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From: Houston, Texas

Yep all the tell tale signs of the Dummy Plugs and Stand pipes failing. It'll take some time, but good you know which side is causing the proble, git'r done.