Home » Public Forums » GMCnet » Dropping fuel tank to repair leak. (Considering improvements while I'm at it.)
| Dropping fuel tank to repair leak. [message #352251] |
Tue, 18 February 2020 14:43  |
Bill Van Vlack
Messages: 419
Registered: September 2015
Location: Guemes Island, Washington
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Senior Member |
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Filled the coach last week and found fuel leaking at the front driver's side corner of Aux tank, from above the fill connection. Slow(ish) leak and eventually stopped after driving 5 mi and raising rear of coach. I'm home now, and planning to drop the tanks and figure out what's going on - once I find somewhere to pump the (50?) gallons of fuel.
In any event, I plan on replacing the rubber supply and vent lines with metal and moving the Onan supply from the Coachman tee to the GM stock location. Also splitting off the Aux tank vent and running it forward closer to the fill vent line.
So, one question is how to couple the new metal lines to the sender assembly. I have seen photos of 3/8" compression fittings and others showing short rubber nipples with hose clamps. I am leaning towards the rubber nipples - seems like good vibration isolation - and wondering if it's worth it to swage a bead on the ends of the new lines.
Another thing I am wondering is whether in-tank pumps are a good idea. Any issues with fuel pump cooling at low fuel levels? Also wondering whether leaving the two existing external EFI pumps as a backup makes sense - would they pull through the in-tank pumps?
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid November 2015.
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