[Gmcnet] Gas leak? on "new" 1976 GMC Birchaven

[Wayne Barratt]

Magic Mushroom,

I reciently bought a low milage 23'by Explorer (21,000 miles) and have ended up pretty much replacing every gas line on it!

Your fuel leak seems to be coming from a check valve that is located up at the top of the L/H rear wheelwell IMO. It has two lines running to it one small and another larger diameter one.The valve seems to be part of the vapour venting system of the coach. The lines run up the inside of the wheel housing and get exposed to UV and road dirt and seem to deteriorate .The lines could be leaking or the plastic valve assembly could also be leaking.Filling up the tanks to the brim causes fuel to travel through this breather line untill the level drops in the tanks , then the leak will stop.

On my Explorer all of the gas lines (12 years old) were showing signs of age, I jacked up the coach in my drive and lay underneath it for a while doing the job. Some of the lines were 10 feet long so you will be buying alot of fuel hose!

On your coach, I was thinking of buying it 2 years ago (from Autohaus of Los Gatos I think), they told me it had very low miles on it (cant remember how low). It had Colorado plates on it too I think. Couldnt afford it at the time however,

Nice vehicle!

Wayne

1976 GMCII by Explorer 23'