I have the usual arrangement - fuel tank
, then copper pipe to Racor
filter, then rubber hose to mechanical fuel pump
, another rubber hose to the second filter, and a final rubber hose to the injection pump
. The filters are both new and clean. The valve on the tank is open. I have new o-rings on the lid for the Racor
Over the summer I had the fuel tank
taken out to have a leak repaired. Since then I have been having the following problem:
starts fine. Then after about 10 minutes it runs out of fuel
and dies. I know this because if I open up the racor filter, the fuel
level is down to the level of the outlet hose. I top it up with fresh fuel and then, after a bit of self-bleeding, the engine
starts and runs fine for another 10 minutes.
My diagnosis is that we are somehow getting air sucked in to the pipe that leads into the Racor. I am presuming the leak is before the Racor and not after it as it is the Racor that is filling with air while the fuel is being sucked out to fuel pump
. The fuel pump
would seem to be functioning fine.
Is that a correct diagnosis? Or am I missing something?
If it is correct, then the next question is where is that air getting in to the system. The obvious suspect is the connection between the copper pipe and the valve on the tank, since that is what was disconnected when the tank was removed.
I have removed that connection twice, and applied some sticky blue sealant
that is meant for fuel and gas lines. But, alas, it has not remedied the problem.
So, how do I find where the air is getting in? There are no fuel drips that I can see anywhere.
And how do I seal it? I am still, I guess, suspecting the pipe to valve connection. Is there some other sealant
I can smother the joint with to ensure it is air tight? Or, again, am I missing something? For good measure I could also smother the valve to tank joint (which was not disturbed) and maybe the copper pipe to Racor connection, which was also not disturbed?
Or could there be some pinhole in the copper pipe? How would I find that?
Any suggestions would be very gratefully received!
Thanks in advance,