gas problem
We have a Sportscoach III , on a C-30 chassis, with a 454 in it . Made by Chevrolet before Sportscoach was taken over by Coachman. It has a 100 gallon gas tank on it . We took it out for a test drive and an overnight 4 or so months ago and we nearly filled it up , gauge read 3/4 , See I had 4 5 gallon cans full of gas here so I put 3 in and on the forth one the tank overflowed . The fill pipe has an overflow catch tube that goes back into the tank . Any way so the overflow made it smell like gas in the coach so bad that I put a fan in there to blow it out . Also I siphoned out 2 gallons to hopefully prevent any heat expansion from more overflow and smelling things up again . The smell got worse so I siphoned another 3 gallons out . The smell persisted, then yesterday the gas level was up to the overflow tube and gas was visibly leaking along the right rear side where the full tube is located . So I siphoned out 3 more gallons ... That's 8 total gallons . I could see the gas level about a foot or more down the fill tube . I am flummoxed, no way that was heat expansion.. Afterwards I hear a plop plop like a bubbling coming out of the Overflow tube and I put my finger over it and it stopped ... It was like there was air coming out but just a bubble at a time ... So I started it to see if maybe there was a vaporlock or something in the system..It started right up and ran no problem . Went and looked at the level again and it was the same ... I can't figure out what it could be . We plan on driving it at least 2,700 miles in a months time and I do not want this to happen again . My wife, " the plumber's daughter" who always finds the leaks before I do mentioned there could be water in the tank .. But 5-8 gallons would be on the bottom of the tank and it would definitely not run well or at all like it did . Also the tank gauge is apparently broken or the sending unit is stuck on 3/4. Any ideas out there on what it might be?
