[Argess]

I have a pressure guage on the fuel log just before the carb. When I shut the engine off, the pressure drops to zero in a few seconds. The fuel log also has a bronze filter. If I remove the cap from the filter, it is more or less dry. So, it appears the fuel in the lines siphons fairly quickly back through the fuel pump to the tank.

Is this normal for a mechanical fuel pump? Mine is a Carter, P/N M6905 I think.

My memory for these things isn't that great, but I think it used to take quite a bit longer....like a few minutes, or even much longer....for the pressure to drop once the engine was shut off. Do you think this may be a sign my fuel pump is failing?

Just curious as I am investigating what might be a fuel delivery probem. Pressure is fine at idle (7 psi). Pump inlet vacuum is also fine (17 in Hg). I have yet to do a volume/flow test.