----- Original Message -----
From: "Keith Kaplan" <keithka@microsoft.com>
To: <shop-talk@autox.team.net>
Sent: Tuesday, May 21, 2002 5:57 AM
Subject: Diesel won't shut off
> Isuzu NPR 3.8l turbo diesel cab over moving truck, 140k+ miles, 2 years
> of reliable service for me. Even in the dead of winter, between racing
>>
> Here's another question for all you diesel experts:
>
seasons when it only gets driven once a month, it always starts right
> up, thanks to two giant batteries.
>
> Maybe 6 weeks ago, I parked it on a funny slope for a few weeks.
> When I went to start it, I could tell it was cranking slower than
> normal, and didn't start. About 5 minutes with my 110v battery
> charger/jump starter and it started right up. I did a few errands,
> shutting off and restarting the engine, no problems. Then I parked it
> for almost a month, and tried to start it again yesterday.
>
> Same slow cranking, so I put the same charger on, but this time it still
> didn't start. Left the charger on for a few hours, still no start.
> Lifted the cab to look for any obvious dangling wires/hoses, didn't see
> anything. Pulled out the air filter, and maybe a cup or two of water
> ran out. (It's an ordinary paper element, not an oilbath style. The
> air intake snorkel cap looks good to me, but we sure do get our share of
> rain out here.)
>
> Lowered the cab, left the air filter out completely, sucker started
> right up. Put the air filter back in, unhooked the charger, drove
> around the block. It ran great, but when I pulled the key out, the
> engine kept running. When I turn the key from off to on, the dash
> lights come on, indicating the key switch is still working. I had to
> pull a fuel line off between the tank and the water trap/filter to get
> the engine to stop.
>
> It can't be a coincidence that it wouldn't start, and then wouldn't
> stop, since it's never had either problem before. Could there be some
> kind of fuel valve that was stuck shut at first, then stuck open? How
> is a diesel engine supposed to shut off? All the standard ways of
> stopping a gas engine involve parts that aren't on a diesel. The wiring
> is pretty well routed and zip tied so I don't think anything could get
> pinched by rasing/lowering the cab.
>
> For some odd reason, there's no Isuzu NPR enthusiasts mailing list, so I
> have to ask here. I think I know my way around a gas engine just fine,
> but all I know about diesels is to put that other kind of fuel in there,
> and that they sound and smell funny.
And you are experiencing the golden rule of diesels. Maintenance....you've
gotta do it especially changing the oil or it'll up and die on you right
when you don't need the trouble.
The runon problem is related to the fuel pump being 'allowed' to continue
pumping fuel. Might be a an internal fault but check any electrical connects
to it are good.
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