Lift Pump cavitation - Ford Powerstroke Diesel Forum
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Old 01-18-2010, 01:00 PM
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Lift Pump cavitation

This morning my 2000 F350 wouldn't start. It wasn't cold around here and I drove it last night. When I came home the low fuel light was on. When it wouldn't start I figured that maybe, just maybe I sucked some air up into the line and that screwed me. Well I checked the fuel filter, and replaced it while I was there. Then I replaced the CPS. Figured I just got the truck a few thousand miles ago so I might as well replace it.

Well the fuel pump still gurgles. I have tried turning it over until the batteries died. Charged them up and killed them again. The pump still doesn't seem to want to prime. It is pumping fuel because I can open the water seperator and drain the filter housing. The pump will keep filling it up.

I am on the hook for a new pump? Needless to say that today is not a good day for me to spend that kind of cash.
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Old 01-18-2010, 04:58 PM
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If you need a new pump I have one forsale for 95 shipped. brand new in box still never installed. Just a heads up.
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Old 01-19-2010, 07:08 AM
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Still no luck but here is what all has been done.

Checked all fuses (pulled and checked with meter) --- all good
Checked fluid levels --- all good
Replaced CPS -- had a grey one already, but what the hey
New Fuel Filter -- old one looked ok, but I just bought the truck
Drained all water from filter -- just a little in there, not much at all
checked to see that pump was moving fluid -- keeps pouring out the drain if pump is on.


Still left:
Check pressure -- trying to figure this one out.
Glow Plugs -- shouldn't matter much. it is 60 here
FIX PROBLEM -- no clue what is wrong so this could take a while.

Any help is greatly appriciated. This is my ride to work so for now I am on two wheels and pedaling.
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Old 01-19-2010, 07:19 AM
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I pulled the hose of my rail pump and cranked to make sure fuel was pumping fast enough.Could also be idm.No way to test unless replaced or borrowed.Good luck.
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Old 01-20-2010, 11:21 AM
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Well it turned out to be something on the glow plug system. Or atleast I think it is. I plugged it in Monday night and saw no change. I plugged it in last night again, figured it couldn't hurt anything. Cranked right up. I have a new GPR to put in after work. Problem is that now the idle is up around 1200 which it has never done before. Well I guess finish one problem and on to the next.
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Old 01-20-2010, 11:39 AM
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The high idle is controlled by the PCM. It can idle up anywhere from 750 to 1200 or so.
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Old 01-20-2010, 11:41 AM
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What causes it to idle up? Right now when I first start it it runs like it should. Then after a minute or so it idles really rough at 1200 and stays there until I turn it off. If I am in the throttle it runs normal.
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Old 01-20-2010, 11:43 AM
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If you also tap the brake it returns to normal. I think it's ambient temp, oil temp, coolant temp, IAT. Just cold weather. It's more to keep the cylinders from wet stacking than anything else I think.
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Old 01-20-2010, 11:49 AM
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I must have a problem in there somewhere then. The brake doesn't change anything. I know that it did before these problems started. The truck would kind of surge by idleing up and back down when it just sat there for a long time (loading and unloading a gooseneck). Now it goes up to 1200 and sits there shaking around like an out of balance washing machine. I am going to check all the connectors and hoses when I get into it this afternoon. Right now it is 55 degrees here so it really isn't that cold.

All the gauges look normal and there is still no check engine light or any other indication that something is wrong.
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