| Re: [GMCnet] Fuel issue [message #326989 is a reply to message #326986] |
Sun, 10 December 2017 20:52   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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john arbuckle wrote on Sun, 10 December 2017 20:04Hoping for a little input in regards to a fuel issue I am having. I have had the GMC for many years but it had been sitting for a few years and I am back at it. I have a 1976 palm beach with a mechanical and inline electric pump. I drained the fuel tanks and put in 10 gallons of new gas. I was not able to get it started as it appears the rear tank fills first and I do not believe the tank selector valve is working. I bypassed the selector valve with the rear tank line directly to the engine. I was able to get it to run for about a half hour and then turned off as usual. Today went back and it started up but then dies. I disconnected the fuel line at the carb and no fuel???? Is there something in the tank that could be sticking that causes it to run and then cut off the fuel supply?? I really appreciate any input/ assistance.
John Arbuckle
1976 Palm Beach
Bellingham Washington.
John,
Yes, the OE system fills the rear tank preferentially on the early part of a fill from low fuel.
You drained the tanks, like from the drain plugs?
And then you poured in gallons from gas cans?
You say you ran it for an half of an hour...
Did you just idle it or did you travel at all.
Even if you only idled her, you still burned off 2-1/2 ~ 3 gallons of the 8 that ended up in the tank and and if the coach is sitting still and not perfectly level, there is no telling how much you could actually get back out.
So, that is why you are out of fuel.
Yes, your tank selector valve is probably bad, many are. Just replace it while you are doing all of the other work that you have to do under there while you are replacing all the rotted out rubber lines.
I suggest that you also look up two things that are a result of my (unfortunate) experiences.
Do a search on the forum for both:
<recommending high> recommending high T, 29 July 2012 21:06
<lifting fuel tanks> lifting fuel tanks when alone 27 June 2012 10:06
And once you believe you have managed to decode them, if you have questions, contact me. I love sharing hard won knowledge.
If you have a hard surface to work on and can get the coach high at all, the tanks are just not that hard to manage.
When you get the tanks back up, more fuel should do it, but remember to put save some to wet the carburetor  .
Think about putting in two low pressure pumps instead of the fuel selector. It will take one extra wire, but give you a chance to circumvent a lot of other issues.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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