Join Date: Apr 2008
Location: Seattle, WA. USA
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Racor draining, where is the leak?
I've been trying to figure out where the leak is in my system.
I have a pacific seacraft 37. Last spring I had my diesel tank replaced, and I changed the fuel filter etc. My racor is about three feet above my tank, and there is a fuel pump pulling fuel through the racor. A line leads from the racor, to a shutoff valve at the racor, to a shutoff valve at the tank, to the fuel pickup, into the tank.
When the fuel system is primed, with no air, if I leave it for two weeks and come back, the racor is drained down to the fuel swirl inlet, about 1/2 way down the bulb.
There is no fuel leaking in the boat - which makes me think the fuel is returning via the fuel pickup line. If I close the fuel shutoff at the racor, the racor stays full. If I close the fuel shutoff at the tank, the racor stays full.
When the racor is empty, I can turn on the ignition and the fuel pump will fill the racor and prime the pump. So I can start the engine without having to bleed (which is sweet. thank you yanmar.)
When both shutoff valves are open, if I turn on the ignition the fuel pump never shuts off. It should shutoff when the system has pressure. While the ignition is on, if I shutoff the fuel line at the tank, the pump stops pumping - there is a click every few seconds rather than many per second. So it seems to me that the leak must be between the fuel shutoff at the tank and the tank itself?
I can't imagine how the racor would drain without air being introduced into the system somewhere.
As I haven't seen any diesel leaking in the boat anywhere - I'm assuming that the fuel pickup line, inside the tank must have a leak. Above where the fuel pickup enters the fuel itself.
Has anybody else run into this problem? Do any of you have any ideas on what the problem is?
I would hate to pull the tank, "fix" the pickup, reinstall, only to have the problem remain.
Thanks in advance,
PSC 37, #234.