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Old 09-21-2016, 06:11 PM   #21
Bus Nut
 
Join Date: May 2016
Location: Georgia
Posts: 461
Year: 1987
Coachwork: Carpenter
Chassis: IH
Engine: IH 9 Liter
Rated Cap: 66 + driver
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
Mini-Skoolie
 
Join Date: Sep 2016
Posts: 16
Quote:
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
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Engine: DT360
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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.

-Christopher
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