Re: Fuel Pump Leaking

Posted by HH56 On 2015/9/12 21:23:43

The only way I can see that the gas could get to the top of the pump from the filter bowl or from anywhere else via the tubing is if the diaphragm has a pinhole allowing the gas to get on top of the diaphragm and run out the air vent. There is a small hole in the top casting directly below the part bolted to the engine which is open to air. Possibly fuel could be running out that hole and laying on the pump if it got on top of diaphragm. If the diaphragm does have a problem it needs to be corrected before fuel gets into the engine. On second thought I think there is a seal on the actuating rod so not as likely to get to engine as it is to squirt out the vent hole.

The way the filter is constructed the tube from the pump opening is in the casting at the very top. Not likely there would be any siphoning. If the diaphragm is good have you positively ruled out a crack in the glass and fuel is dripping on the engine and then running down onto the pump?