Air in my fuel after start up.. - Ford Powerstroke Diesel Forum
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Old 03-30-2013, 02:38 PM
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Air in my fuel after start up..

So my efuel system is still acting up.. I turned the pump on today and crawled under the truck to find a fuel leak and it started cavitating (air in the lines at the pump) about 15-20 seconds after I turned it on. I turned it off, waited a few minutes and turned it back on and the same thing, sounds very strong for a few seconds, then air again. The fuel pressure gauge under the hood shows it holding 65is psi, but the needle dances a bit once the cavitation starts. I checked all the joints and an fittings in the system and no leaks, could this be an in tank problem or... gulp... a problem at the injectors letting air in? I really hope its not the latter, but I dont see how air entering the system AFTER the pump can cause cavitation at the pump. soo lost here
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Old 03-30-2013, 03:13 PM
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I don't see air getting in at the injectors.
I'd think an in tank issue or maybe at your selector valve.
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Old 03-30-2013, 04:09 PM
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if the breech were outside the tank, wouldnt there be a fuel leak at the same spot? What should I be looking for if I go inside the tanks?
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Old 03-30-2013, 04:44 PM
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I'm not entirely sure on the OBS pickup assemblies, but for SD 7.3s and 6.0s, they would crack and let air in when the tank got low on fuel.
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Old 03-30-2013, 07:51 PM
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there should be a screen on the end of the pickup tube inside the tank they are known to break
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Old 03-31-2013, 12:45 PM
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I have had the tank pickup fall off (common problem with the pickups on these trucks) which caused the truck to suck air when the tank still showed 1/2 full. But I'd expect the cavitation would go away when you switched tanks (unless they both had fallen off?) or if you fill the tank full...where they break is somewhere around 1/2 full if I recall right.
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Old 04-10-2013, 03:17 PM
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my problem is with both tanks no matter where the fuel level is, you can hear it start sucking air after about 10 seconds of the pump being on, engine running or not. Actually got stranded on the highway last weekend, lucky enough I coasted down an off ramp and into an autozone parking lot when the fuel pump gave out!!
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Old 04-11-2013, 04:35 AM
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Is there a way you can split the problem? for example, could you rig up a system to run a hose from a bucket of clean diesel to the pump in order to prove that your pump and system forward is working (it should run fine "out of the bucket"). If it still sucks air, you know your lines, selector switch and tanks are not the issue (and vice versa). I know it takes a little "doing" to wire up something temporary like this...but it seems the only other way is to tear into the tanks and selector switch strategically.
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