From: MV (MV@dc9.tzo.com)
Date: Mon Apr 24 2006 - 12:20:31 PDT
Well I'm cranking it off of only two batteries so perhaps that is a
problem. It is setup for 4 - 31C's I believe, all in parallel. This
truck does not have an additional fuel pump either. It must use the
suction pump built into the injector pump also. It is also drawing
through a fuel filter and a homebuilt fuel preheater that is prior to
the filter. To get it started I have to ether it lightly, and then pump
the pedal quite hard initially to keep the engine running at the first
start of the day. If I don't ether it - it will not quite catch and
fire - it just sort of stumbles. But once the rpms get up there - it
runs fine. The more I think about this, the more I think that perhaps I
should add a fuel pump to push the fuel through the fuel preheater and
filter. As you said I may also have a slight fuel line leak that is
allowing air to be sucked into the injector pump. There are a ton of
fitting between the dual tanks and the injector pump - so that would not
surprise me at all.
Do you know roughly what MPG you get with your truck?
Thanks,
Dave
J wrote:
> I have the same engine in my truck and it is not that hard to restart.
> In the winter, I give it a snort of starting fluid into the air cleaner
> and it starts. Won't start without that. I have the preheater, but it's
> not hooked up, yet. I have 4 batteries in my truck, so I have plenty of
> crank. At 70 degrees, it should start within 5-10 seconds after sitting
> for a day to a week. I suspect you have a leak in the fuel line. The
> Cummins setups in the military trucks have no fuel pump to deliver
> pressure to the injection pump. It only has the small gear pump that is
> painfully slow. I bet you have a loose fuel fitting somewhere. Try
> purging the line and then starting it once, just to confirm this. Jim
>
> MV wrote:
>
>>
>> Guys,
>>
>> I have an NHC 250 engine in a civilian truck - it requires either to
>> get it started even when it is warm outside. It does not have glow
>> plugs. It had an ether quick start kit installed on it when I got it.
>> The military NHC 250s seem to have a preheater installed on them with
>> a glow plug and a spray nozzle of some sort in the intake manifold.
>>
>> Is it normal to have to ether these engines even when it is warm
>> outside - like 70 degrees? Once I get the engine running - even if I
>> shut it off for a couple of hours - it will easily restart. But ether
>> is required the first time each day. Not a lot, just a one second
>> spray in the top of the stack.
>>
>> The engine runs well - no smoking at all. And that is without a turbo.
>>
>> Dave
>>
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>
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