| Saturday fuel line Fun and mystery [message #243730] |
Sun, 16 March 2014 08:48  |
Joe Weir
Messages: 769
Registered: February 2013
Location: Columbia, SC
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After the rebuild, it was very hard to prime the gas lines, and after shutting down it became apparent by the sizable pool of fuel, that the rubber lines were shot.
Finally got a sunny Saturday off to get the GMC properly jacked, blocked, and leveled to allow access to the tanks. Compounding the issue is the fact that the Coach is not fully on the concrete driveway and the driveway is higher on one side, so some shade tree engineering was necessary to get everything stable.
The fuel was pouring from the combo switch area but prior to getting the coach back in the air, I could not see what else was bad and had assumed all the lines would need to go.
When I was able to slide under I found a bit of perplexing PO disease. The aux tank 3/8" rubber supply line comes off to the side of the tank to a galvanized "T". The front of the T is 5/15" and runs to the combo valve, but there is a facet style fuel pump (with 5/16" size fittings) spliced between the T and the Valve. How none of that leaked with 3/8 rubber line is a testament to the clamps.
OK, perhaps a homemade anti-vapor lock addition, I think. But what is really curious is that the back of the T off the aux tank runs to a 1/4" hard line that disappears somewhere back at the main tank. I will have to drop the second tank to find out where it terminates, as the rear corner where the onan is is the closest to the ground thanks to the slope of the driveway - not enough room for me to slide under and poke around right now.
It has to be a supply line, and I only have two tanks. The main line for the primary tank is hooked to the combo valve (and looks to be an unmolested run from the tank as far as I can tell now) and the GMC was running fine before the rebuild on that tank. Perhaps it is taking fuel from the onan pickup as some sort of incline assist fuel solution? Interesting idea, even if the execution was a bit dodgy.
Anybody heard of this before?
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
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