The tanks Don't have fuel pumps. Known issues with the 6.9 diesel fuel system is the water seperator on the firewall. The drain is known to not seal after time and allow the lift pump to draw air and not fuel. Stick a bolt in the drain and hose clamp it there temporaraly to see if that fixes the issue. If that doesn't help then do this lift pump test:
Do a pressure and flowtest of the fuel pump at the Schrader valve on the filter header (FSS- fuel shutoff solenoid disconnected on IP). Remove the tire valve core and hook a hose and pressure guage on it should see 4-6 psi when starter cranking engine over. Then do a fuel quantity test same place, should see 1/3 pint in 10 seconds of starter engine cranking, route fuel to a suitable container with a hose. When all finished hook up the FSS wire .
Some IPs have an ability to pull fuel....... if your installation of the new lift pump is incorrect it can fail ASAP after install. There should have been a paper in the box re this info.
The FSS is the electrical conector on the top of the IP D/S FRONT connection.
Also check that the selector valve isn't stuck in the middle of it's travel.
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Last edited by chuckster57; 10-05-2011 at 12:41 PM.
Reason: added info
The local guys (Davis Diesel) are pretty good - way better than having me and my buddy work on it I am certain - I'm a decent R&R guy, and can diagnose old Mopars (and Subarus with computer thingys), even my F350, but I don't have time for this one .
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