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Old 02-17-2019, 03:24 PM   #1
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DT466 Fuel Issues - Any Advice?

Hi Everybody,

I'm not new to the forum, I had a different username but I can't get it to work for some reason. Always get locked out. Anyways, I created this one and I'm not sure if I'll be able to post pictures yet but I'll try...

Anyways, I have a 2008 ICCO RE300 with 160K miles. It has a 7.6L L6 Engine with a 466 CID Transmission. I'm having issues which I believe are fuel related but am not sure how to fix.

A month or so ago my bus would start but then die after about 1 minute of idling. It sounded like it just wasn't getting enough fuel. I changed out the fuel filter and got it to start and run for 30 minutes. The next week I couldn't start it again. I changed out the fuel strainer and charged the batteries. After quite a few tries it fired up. I was able to move it and let it run for about an hour with no issues. It started right up the next day as well.

The following week, however, it did the same thing where it starts then dies after 1 minute. I don't think it can be air in the fuel system since I'm able to let it run for quite some time with no issues when I get it started. Any ideas on what this could be? Maybe a clog?
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Old 02-17-2019, 03:27 PM   #2
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Here are some pictures. The housing is from another bus. It sits right above what I believe to be the pump (which I have a picture of as well as an online breakdown of). I also attached a drawing of what I could see. Its hard to get to all this in my bus but I tracked the fuel lines to the tank. I'm not sure which way the fuel flows.

I was able to drain all water out of the filter. The filter and screen were pretty crudy when I changed it. I'm not sure what tool I need to check the fuel pressure or how to go about trying to get rid of any clogs there may be in the fuel lines.

Not sure how it can be a clog or air in the line if I was able to get the bus to run well for an hour or so straight a couple of times. Any help is much appreciated!
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File Type: jpg bus3.jpg (117.1 KB, 6 views)
File Type: jpg bus1.jpg (371.3 KB, 8 views)
File Type: jpg bus2.jpg (367.7 KB, 5 views)
File Type: jpg bus6.jpg (240.7 KB, 6 views)
File Type: jpg bus4.jpg (155.8 KB, 5 views)
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Old 02-17-2019, 07:37 PM   #3
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Join Date: Feb 2016
Location: Indianapolis, IN
Posts: 155
Year: 1999
Coachwork: AmTran
Chassis: International FE
Engine: DT466E
Rated Cap: 84 passengers
So the bus is really only having a hard time getting started after it has set for a while? And once it is started it is having no trouble continuing to run?

If that is the case I don't think you have too big of a problem on your hands. I'm not as familiar with the newer buses but there is probably a check valve built in to the fuel delivery circuit to prevent fuel from draining backwards toward the fuel tank. After you leave the bus sit for so long it is inevitable that some fuel is going to drain back into the fuel tank but ideally your check valve keeps enough fuel in the circuit in order for the engine to initially start and stay running as your fuel pump sucks fuel all the way back up from the tank. On the older buses this check valve is actually a small ball built into the fuel primer pump assembly. Does your bus have a primer pump?
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Old 02-18-2019, 07:15 AM   #4
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I haven't found a primer pump. I followed all the fuel lines as best I could and only found what I drew up in one of the pictures I attached. However, it's very difficult to get to all this on my bus as there are many things in the way, and I'm also not mechanically inclined, so I may have missed it.

So you think it may be the fuel check valve not holding fuel in place while the bus sits?
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Old 02-18-2019, 08:51 AM   #5
Skoolie
 
Join Date: Feb 2016
Location: Indianapolis, IN
Posts: 155
Year: 1999
Coachwork: AmTran
Chassis: International FE
Engine: DT466E
Rated Cap: 84 passengers
As long as you're not having any issues once you actually get the bus started, yes. In some of the older buses with the DT466E in them the primer pump housing has a small plastic ball that acts as the check valve. Fuel can flow past it when you're using the primer pump but the plastic ball is supposed to prevent fuel from flowing back to the fuel tank. Over time this little plastic ball can develop small dents or flat spots on it and it doesn't do a great job of sealing anymore. Do some more snooping around and see if you can locate a primer pump. If your bus has sat for a long period of time you can always use that to help suck some fuel back up to the engine before you try starting it up. That should help ease your starting woes.
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Old 02-18-2019, 08:56 AM   #6
Skoolie
 
Join Date: Feb 2016
Location: Indianapolis, IN
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Year: 1999
Coachwork: AmTran
Chassis: International FE
Engine: DT466E
Rated Cap: 84 passengers
Actually, now that I look at it. I think your primer pump is that big round button on your pre filter (or your "fuel screen"). If that is what I think it is, you can press that and suck fuel up out of your tank, through the pre filter, and through the fuel filter. When it starts to stiffen up on you that means your fuel system is primed. Go ahead and start the engine at that point.
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Old 02-18-2019, 10:47 AM   #7
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Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
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Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
A quick Google search: https://www.google.com/search?client...6e+primer+pump

Do you have a primer pump that looks anything like this?

or this?
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Old 02-18-2019, 10:53 AM   #8
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Also, as rensch26 was mentioning, check if this is a primer pump:
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Old 02-18-2019, 10:56 AM   #9
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One more video:
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Old 02-18-2019, 01:44 PM   #10
Mini-Skoolie
 
Join Date: Jul 2016
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Year: 1999
Coachwork: Bluebird
Chassis: 3800
Engine: DT466E
Rated Cap: 42
My 1999 466 has that one and I had to replace it at a cost of about $9. It was leaking air and a bit of fuel so that you would start the engine and it would die less than a minute later. The fuel was running back into the tank, but if you ran it at least once in a week, it would retain enough fuel in the lines to stay running.
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