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Will a air leak at the filler pipes cause fuel to drain back


 
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MisterCruiser
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Joined: 07 Oct 2013
Posts: 187
Location: Ireland

PostPosted: Sun Oct 08, 2023 11:55    Post subject: Will a air leak at the filler pipes cause fuel to drain back Reply with quote

I'm investigating an issue where the diesel drains back to the tank overnight and I then have to prime the filter to start.


Will a air leak at the filler neck hose pipes cause fuel to drain back or can these be ruled out?
Also, if I open the filler cap and hear a pressure hiss releasing, it this normal or indicate the breather is blocked or such.

This issue only arose after I refitted the fuel tank and I had the filter unit pushed out of the way whilst making room to weld up a new battery tray.

I can fit a non return valve but would like to fix the air leak first if possible. The hose return / supply rubber hose pipes that connect at the top of the tank look to be sealed ok, I don't see leaking fuel anywhere.
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