Starting Problem
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Junior User
Joined: Feb 2004
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Starting Problem
85 E350 6.9 When I do not start for one day it will start run a few seconds and then stall.. 
Then have a hard time starting it eventualy does start. If I start evryday it is fine but with the cost of fuel these days cannot afford to drive daily.... Is theis the lift pump perhaps????? Thanks for any help you can give. 
Then have a hard time starting it eventualy does start. If I start evryday it is fine but with the cost of fuel these days cannot afford to drive daily.... Is theis the lift pump perhaps????? Thanks for any help you can give.
Senior User
Joined: Jun 2005
Posts: 116
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From: Bridgewater, NJ
It sounds like the transfer pump located on the right side of the engine block may be on its way out, causing the fuel pump to lose its prime. When it first starts up and runs for a few seconds, it's most likely sucking the fuel that's leftover in the filter, then gets nothing but air until the pump can build pressure back up and get fuel flowing from the tank. It's also possible that a line between the tank, transfer pump, and filter could also be damaged and is allowing fuel to drain out.
Post Fiend
Joined: Nov 2004
Posts: 5,638
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From: Manitoba
Your symptoms are classic air in the fuel lines, how it gets/got there can cause permanent hair loss........ The 85s have a water separator under the floor I believe. If you drained it recently they can and will stick open slightly allowing air into the fuel system. Any drainback can come from many areas and go both ways 1) to lift pump. 2) to tank via return lines. How old are the return lines and plastic caps, did you move any recently. They will break their seal if old and moved. Give us some more info.......
Check out this web page....... http://www.intellidog.com/dieselmann/idi2.htm
Check out this web page....... http://www.intellidog.com/dieselmann/idi2.htm
Posting Guru
Joined: Sep 2002
Posts: 1,897
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From: Northeastern Pa - USA
Today's fuel dries out the o rings under the plastic return caps and they leak (sometimes show up at the caps and sometimes not). The lift pump may be going bad too, it usually shows up as dampness at the weep hole in the side of the lift pump. Try parking with the nose low on a grade and see if it works better for you. That will tell you the system is getting air. If the injection pump is suffering from viconseals it will show up in the neck of the injection pump (hard to get to with your fingers, as it is right behind the mounting flange).
Elder User
Joined: Oct 2002
Posts: 743
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Mine does the same thing, but only when I run it on the front fuel tank. I had the sending unit out last month and noticed that the return line had a red rubber cap on it like an anti-siphon device. I saw that it dripped all the time that it was out of the tank. I'm thinking that either that, or the o-rings somewhere are to blame from the front tank area. The rear tank doesn't do this, so at least I have an idea where to start.
My first thought would be to go through every single connection from the tank forward and replace rubber o-rings and any dry or old lines. If you have a switchover valve, I would look there too. If you can't find the leak, hook up a mity-vac to the fuel line and spray something on all the connections till you see it suck the stuff into the line.
My first thought would be to go through every single connection from the tank forward and replace rubber o-rings and any dry or old lines. If you have a switchover valve, I would look there too. If you can't find the leak, hook up a mity-vac to the fuel line and spray something on all the connections till you see it suck the stuff into the line.
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