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Old 09-21-2016, 06:11 PM   #21
Bus Crazy
Join Date: May 2016
Location: Georgia
Posts: 2,264
Year: 2001
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Chassis: IH
Engine: T444E
Rated Cap: 14
GM's are notorious for the plastic fuel caps not venting after some years.

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Old 09-22-2016, 01:45 PM   #22
Join Date: Sep 2016
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Originally Posted by Brad_SwiftFur View Post
GM's are notorious for the plastic fuel caps not venting after some years.
That would make my day if that's all it was. I will check that out, I also believe that this tank is not the stock tank and the cap is not vented, so I will explore that and see what it looks like.

It reminds me of all the caps on the diesel fire trucks/ambulances I used to drive, simple steel tank with hard steel cap. Maybe my post count is high enough I can post some pictures too.

I also noted that the new fuel line/filter that the guy who changed the carb installed lays right on the heater hose so perhaps vapor lock is still an issue.
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Old 09-22-2016, 02:55 PM   #23
Bus Geek
Join Date: May 2009
Location: Columbus Ohio
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Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
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that will do it... fuel lines on top of heater lines or next to the exhaust will definitely cause issues... at least it did on that 500 HP small block monte carlo I had the issue with... I never realized vapor lock could occur while running.. but it can.. and only gets worse the lower the fuel pressure drops and the hotter things get.. the fuel atomizes in the hoses instead of in the carb, which jacks up the fuel mixture settings as the carb is expecting to spray out a fine liquid to atomize in the intake and cylinder, as opposed to pushing vapor out the jet which will make you run Lean.

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Old 04-06-2019, 03:12 PM   #24
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Location: south east BC, close to the Canadian/US border
Posts: 2,265
Year: 1975
Coachwork: Chevy
Chassis: 8 window
Engine: 454 LS7
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Originally Posted by cadillackid View Post
great idea I hadnt thought of!!.. and one i had bite me once in a car where the fuel tank vent was plugged

I've had that happen on two vehicles and a pressure washer - funny, when it happened the 2nd, 3rd times you'd think the gas cap would be the first thing you'd check, but all 3 were so many years apart, it took me a while to figure out what the problem was all 3 times -lol
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Old 04-06-2019, 11:52 PM   #25
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Join Date: Mar 2018
Location: Fingerlakes region NY
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Year: 1999
Coachwork: AmTran/Wolfington
Chassis: 3800
Engine: International DT466E 190HP variant
Rated Cap: 72 pax 29500 GVWR
This thread is almost three years old my friend! I wonder if OP ever fixed his issues.
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carburetor, chevy

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