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Old 06-20-2009, 08:31 PM   #1
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Fuel system shut off switch

I have 2005 Allegro Bus 38TGP. Does anyone know if there is a fuel shut off switch for this coach, and where it might be? Is there a fuse, relay or solenoid for the fuel system? If so, where might it be? Engine is Cummins 400ISL. Engine won't start and I need to troubleshoot fuel/pump system so that I can travel this week.
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Old 06-21-2009, 05:52 AM   #2
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What chassis are you on?
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Old 06-21-2009, 05:58 AM   #3
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Mike, I have a Freightliner chassis. I am pretty sure that I have a fuel flow problem upstream of the fuel filter and fuel/water separator that have been replaced and filled to the brim w/ fresh diesel fuel to aid in priming. I get no tell tale smoke or odor at the tailpipe as I crank. I don't know if I have a Cummins problem, engine pump, or a Freightliner problem, transfer pump, problem.
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Old 06-22-2009, 04:39 AM   #4
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Replied to your PM. You are going to have to prime it.
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Old 06-22-2009, 09:02 AM   #5
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Freightliners do not have a fuel cut-off as far as I know. Never heard of one, anyway. Cycle the ignition key on 20-30 seconds, then off and on again, without starting the coach. Do this several times to prime the lines and filters. If you need to verify fuel flow, you could disconnect the outlet hose on the secondary filter to see if fuel flows out when you cycle the key like that.

I suppose it is possible you have blown a fuse for the lift pump, which ought to be in the chassis fuse box somewhere.
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Old 06-22-2009, 09:11 AM   #6
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If your are trying to trouble shoot a no start problem on a Cimmins engine and you don't know where the fuel solenoid is You need help from a profesional. What Is the lead up to this problem. Did you change the filters and it wouldn't start after. Did it set for a long period of time. Did you turn it off and it won't restart. these things are important to know.
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Old 06-22-2009, 05:24 PM   #7
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Originally Posted by RV Roamer [Gary] View Post
Freightliners do not have a fuel cut-off as far as I know. Never heard of one, anyway. Cycle the ignition key on 20-30 seconds, then off and on again, without starting the coach. Do this several times to prime the lines and filters. If you need to verify fuel flow, you could disconnect the outlet hose on the secondary filter to see if fuel flows out when you cycle the key like that.

I suppose it is possible you have blown a fuse for the lift pump, which ought to be in the chassis fuse box somewhere.
Gary, you said "secondary filter". Did you mean inatead the fuel/water separator? I only know of the 2 devices, fuel filter and separator. Is there another filter on this engine?
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Old 06-23-2009, 12:54 PM   #8
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The water separator is a fuel filter too and it is the primary. There will be another filter after it that is exclusively a fuel filter with a very fine porosity, maybe 2 micron. That is the secondary.
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Old 06-23-2009, 07:56 PM   #9
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I dont own a ILS400,but I imagine that it should have an fuel shut-off mounted near the diesel injector pump.
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Old 06-24-2009, 04:24 PM   #10
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I dont own a ILS400,but I imagine that it should have an fuel shut-off mounted near the diesel injector pump.
My ISL does not. There is, however, a chassis battery disconnect that shuts down the electric fuel lift pump as well as everything else electric on the engine and chassis.
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Old 06-24-2009, 08:27 PM   #11
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My ISL does not. There is, however, a chassis battery disconnect that shuts down the electric fuel lift pump as well as everything else electric on the engine and chassis.

If that is the case how does the ISL 400 engine stop when you want it too.
It seems to me the you must have a positive cut-off of the fuel being delivered to the high pressure pump when you place the ignition sw.to the off position.
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Old 06-24-2009, 09:02 PM   #12
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The injectors are electronic, basically ultra-high test 3000psi solenoids. All the ECM needs to do is quit signaling injection.
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Old 06-25-2009, 01:37 PM   #13
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There definitely is a fuel supply solenoid but it is activated by the ignition on switch. The lift pump comes on with the ignition on and I think the injector pump as well. But that's not what I call an fuel cut-off switch. There is probably a fuse for the power supply to that solenoid, though.

As E-Mike says, the engine slows or stops when the ECM slows or stops signaling the injectors to inject fuel.
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Old 06-30-2009, 03:48 PM   #14
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Yudamann

Hopefully you've got the problem solved by now but the exact same thing happened to me and a Cummins shop owner helped me do a temporary fix so I could get it to his shop.

The only problem is that my Freightliner has the old B5.9 mechanical Cummins and no doubt there's a BIG difference in the fuel solenoid setup on your rig.

Indeed, as suggested above, my fuel solenoid was right below the injector pump. I was told to feel for a lever that would move up and down and when I did, tie it off so that it would stay in the up position. I found it, tied it off and the engine started right up. Made it to the Cummins shop in Sequin, Texas, and was on the road again in no time.

Now I know what to look for when a perfectly good-running Cummins decides it doesn't want to start even though it cranks just fine.

Good luck with yours.....
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