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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

       
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Old 01-27-2007, 11:35 AM   #1 (permalink)
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fuel system problem

Hey all,long time reader of this forum - 1st posting.Great stuff.I've been able to keep my 93 well maintained for the last year or so with the help of reading past forum postings. I started my truck the other day. gp's cycled fine.fired up and quit after maybe 8-10 seconds. There she sits crying for some attention. My plans today are to check flow from the lift pump but since i'm getting nothing out the exhaust, could it be the fuel shut off solenoid ? I checked and replaced 3 gp's last month and has a new fuel filter. Traced my fuel lines front to back and they seem fine. Tank is 3/4 full. Starter and batteries are strong. Any advice would be appreciated. Thanx.
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Old 01-27-2007, 12:19 PM   #2 (permalink)
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Re: fuel system problem

[ QUOTE ]
check flow from the lift pump

[/ QUOTE ]

Why check, it is too cheap, too easy to replace.

How old is the lift pump?
How long do you expect a lift pump to last?
Would you believe (IMO) that a lift pump older than 60,000 miles is subject to failure?
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Old 01-27-2007, 12:31 PM   #3 (permalink)
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Re: fuel system problem

not sure how old. I've put about 15000 mi. since I bought it a year ago. Wouldn't be surprized if it was original ! I know the previous owner and he admits doing the bare minimum as far as maintaining. Good advice. Little $$$ for piece of mind. Thanx
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Old 01-27-2007, 11:40 PM   #4 (permalink)
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Re: fuel system problem

Check the electrical connections from the loom to the IP. You might have knocked one loose. Sometimes making a connection, sometimes not. you'll only notice the "SOMETIME NOTS". [img]/ubbthreads/images/graemlins/smokin.gif[/img]OkieGringo
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<font color="red">Link to GP Controller Diagram</font> <font color="blue">Link to "Electric Fuel Pump Wiring Diagram"</font>
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Old 01-28-2007, 02:06 AM   #5 (permalink)
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Re: fuel system problem

Sounds like a fuel problem..... probably air entering the system. When you traced the lines did you move any of them, how about accidently when you did the GPs.
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Old 01-28-2007, 11:54 AM   #6 (permalink)
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Re: fuel system problem

thanks for the advice.I checked flow rate of lift pump and its fine. I also checked fuel shut off solenoid and its fine also. Lucky for me it decided to die in my driveway and not up the mountain where I was heading. guess the only good news - i'm learning ! i'll be checking electical connections next.
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Old 01-28-2007, 12:02 PM   #7 (permalink)
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Re: fuel system problem

[ QUOTE ]
[ QUOTE ]
check flow from the lift pump

[/ QUOTE ]

How old is the lift pump?
How long do you expect a lift pump to last?
Would you believe (IMO) that a lift pump older than 60,000 miles is subject to failure?

[/ QUOTE ]

My rig still has the origional lift pump from the day she was born. She has 143,242 miles on it and is still running strong. Though I do expect it to go some day because I do notice a little weariness from the lift pump. I would assume that it would be in my best interest to install a new one soon. But so far so good. Aint that something??? Actually I been just waiting to see how far it will go before failing because of the miles I got on it.

I do have a rebuilt IP, new injectors,new starter and new batteries theyre about 4 yrs old,batteries are 1 yr old and on the second set of GPs this last summer. Starts and runs good thus far.

I just thought Id chime in on the longevity of my lift pump... [img]/ubbthreads/images/graemlins/smokin.gif[/img]
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Old 01-28-2007, 01:29 PM   #8 (permalink)
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Re: fuel system problem

Dave,
My experience was similar, the original was replaced as part of a I/P re-build, this was at 130,000.
At 260,000, I have replace the lift pump total of 3 times, twice after the I/P re-build.

Good Luck
BB
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Old 01-28-2007, 07:09 PM   #9 (permalink)
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Re: fuel system problem

again, thanks for the tips. i've learned to never rule anything out. Okiegringo was bang on. found a dead fuel shut off solenoid on my ip. hopefully i can find one - no luck at our local parts stores. Maybe International can help.
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Old 01-28-2007, 08:17 PM   #10 (permalink)
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Re: fuel system problem

[ QUOTE ]
again, thanks for the tips. i've learned to never rule anything out. Okiegringo was bang on. found a dead fuel shut off solenoid on my ip. hopefully i can find one - no luck at our local parts stores. Maybe International can help.

[/ QUOTE ]
This post may help finding one. You'll also find some advice on removing the top and putting it back on. The top has to come off to get to the FSS.

Best of luck,
Devo
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Old 01-28-2007, 08:25 PM   #11 (permalink)
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Re: fuel system problem

Visit the closest Stanadyne shop in your area.....

http://www.stanadyne.com/new/index.asp
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Old 01-29-2007, 04:36 PM   #12 (permalink)
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Re: fuel system problem

installed new fss today.good news is that its working and getting fuel to injectors.bad news is i keep frying 20 amp fuse on my gp circuit.maybe broken gp wire grounding out ? any advice ?
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Old 01-29-2007, 05:59 PM   #13 (permalink)
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Re: fuel system problem

You have a wire shorting out somewhere. The actual wires going to the GP's don't have fuses, your fuse is probably for the "ignition" circuit which powers the FSS, advance, idle up and GP controller.

Follow the wire harness and see if the wires are touching any metal anywhere. Also the advance solenoid or idle up solenoid could be shorted out, you can just disconnect them to eliminate those as problems.
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Old 01-29-2007, 08:14 PM   #14 (permalink)
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Re: fuel system problem

If it was me, I would disconnect the FSS wire, MAKE SURE THE IGNITION IS OFF, and take an ohmmeter and connect black lead to battery ground, and probe the FSS wire. Make sure that's not showing any continuity. If that shows anything other than open circuit, that'll tell you if you have a short in the wiring harness somewhere.
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Old 01-29-2007, 10:01 PM   #15 (permalink)
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Re: fuel system problem

It would have to show zero resistance for that to work. You will get continuity through the other solenoids.
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