OBS E-fuel problem, cavitation!! How do I get the air out? - Ford Powerstroke Diesel Forum
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Old 03-27-2013, 06:01 PM
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OBS E-fuel problem, cavitation!! How do I get the air out?

The superduty fuel pump on my efuel system cavitates from the time you turn it on until the time you turn it off, engine running or not. It started when I changed the fuel filters out last summer, then about 200 miles later the pump burnt out. I replaced the pump but the cavitation issue is still there. When I replaced the filters I filled both filters with fuel before installing them..

The efuel system I built consists of a 30 micron filter into a superduty electronic pump into a 3 micron filter. The regulator is mounted to the intake and there is no fuel bowl. Fuel pressure is set at 65 via a dial on the regulator... I dont know what it is while driving cause my girlfriend refuses to ride under the hood to watch the gauge

Is there something I have to do when I change the filters or open the fuel system to purge or bleed it of air other than filling the filters? Would running another fuel pump after the 3 micron filter help get rid of the air by creating a stronger suction bringing the fuel out of the tanks?
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Old 03-27-2013, 06:21 PM
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I would say tee in a vacuum gauge before the pump. On stock superduty spec would be no more than 7 in. Maybe it is sucking too hard and burning pump out. Other thing would be put clear line on return and see how many air bubbles are coming through, maybe its sucking are from somewhere. If there is a restriction too great for the pump check and be sure filter is no clogged, tank doesn't have dirt and all lines for kinks.
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Old 03-27-2013, 06:26 PM
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The pump ran great for the summer after I did the efuel, so I dont think its a problem with the pump now sucking to hard... and the cavitation is very very easy to hear. Thats a great idea with the clear line on the return, Ill visit my local hydraulic hose guy tomorrow and see if he has anything I can use on the pressure side to find out where the air is getting into the system. I should be able to narrow it down from a problem in the tank to a problem at the filter/pump.
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