spock500
Senior Member
thanks, have put a non return valve in at tank just temporary fix, no different, pipe to pre filter drains instantly. couple bubbles in pipe from pre filter then 10 -15 mins later completely drains as if tap was opened. is there any sealant for diesel? where is my diesel going??? if not draining back to tank?? it does seem to use more fuel when it does this but cant find leak. still looking for strainer, open new thread.
If the plenum (think I have spelt that correctly) chamber is blocked in the tank itself, this will then create it's own vacuum giving rise to the symptoms you describe.
Ideally get the tank out for a full inspection, failing this, swap the delivery fuel line with the return. This is only a test as the pipes are different diameters which could cause other unforeseen issues.