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Old 09-30-2016, 10:05 AM   #1
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Webasto Not Firing up

Turned on my furnace for the first time. I heard it running, went outside and felt cool air coming from the exhaust pipe. I took down the panel that houses the diesel furnace. I see a fuel filter there with a pressure gauge. No pressure on that gauge. I spun the filter off to see if it was full. The was 3/4 full with old smelling diesel . I am assuming the fuel pump isn't working? Any ideas where it might be located ? Or any other ideas why this is not firing up ?


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Old 09-30-2016, 10:32 AM   #2
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I do love a good diesel fired furnace!!

Ok, so find the fuel line going in and trace it either into the unit or back to the pump. You didn't mention which furnace model you had so it's location is a guess.

I would assume that it is either near the fuel tank or the unit.

check it for 3 things, is it mounted horizontal?(a requirement) Does it click when the furnace is turned on?(it's getting power and running) Are there any loops in the fuel line that are above the fuel pump and not a 90* bend. all other fuel line must be parallel to the horizontal. The pump is not strong enough to purge trapped air pockets.

if the pump doesn't click, check voltage on the line to rule out bad wiring or a bad controller
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Old 09-30-2016, 06:15 PM   #3
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Had a similar problem with my diesel furnace. Turned out to be the fuel line had deteriorated. Read this was a common problem with certain fuel lines. My fuel pump is next to the fuel filter under the furnace cover. You can hook up a line to the fuel filter (if it's near the fuel pump) and put the line in a bucket with diesel.

This is how my fuel pump looks
https://www.amazon.com/Facet-1024AMZ...ct_top?ie=UTF8

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Old 09-30-2016, 11:26 PM   #4
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Before you get dirty try this. Turn off the heat exchangers (toggle switches on the overhead) and turn both thermostats to the off position. Wait a minute or so and then turn the heat exchangers back on and then turn on the thermostats to heat. This is how you reset the system. In my case ('90 Concept) I had been running the heat while running the diesel fuel level down low enough to cause the "Low Diesel" light to come on. I refueled the coach and got back on the road. After a short while we noticed the hydronic heating wasn't putting out any heat. I sent an email to CCC that night and was prepared to have to get into he fuel system the next morning. Gregg Bootes called me in the morning and had me do the reset procedure above and it took care of the problem.

Even if this procedure doesn't solve your issue I figured this is good informative to pass along since we have the same coach. I don't know if there are other scenarios that would require this reset but I do know it's required if you happen to be running the furnace when the Low Diesel light comes on.

Hope this helps.

Good luck!!!

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Old 10-01-2016, 10:54 AM   #5
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Quote:
Originally Posted by Rsponsford View Post
Before you get dirty try this. Turn off the heat exchangers (toggle switches on the overhead) and turn both thermostats to the off position. Wait a minute or so and then turn the heat exchangers back on and then turn on the thermostats to heat. This is how you reset the system. In my case ('90 Concept) I had been running the heat while running the diesel fuel level down low enough to cause the "Low Diesel" light to come on. I refueled the coach and got back on the road. After a short while we noticed the hydronic heating wasn't putting out any heat. I sent an email to CCC that night and was prepared to have to get into he fuel system the next morning. Gregg Bootes called me in the morning and had me do the reset procedure above and it took care of the problem.

Even if this procedure doesn't solve your issue I figured this is good informative to pass along since we have the same coach. I don't know if there are other scenarios that would require this reset but I do know it's required if you happen to be running the furnace when the Low Diesel light comes on.

Hope this helps.

Good luck!!!

Russ


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I did notice that my low fuel light has been coming on when I run the Gen. Even with a full fuel tank. I will try this idea of yours when I get home tonight
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Old 10-01-2016, 11:21 AM   #6
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Hope it works. I know that cntrylife on this forum (he also has an '89 Concept) is having issues with his low diesel light coming on when it shouldn't. I think it has also affected his generator auto-shutdown and maybe his heating. It wouldn't surprise me if a bad fuel level sensor or sending unit was affecting operation of these other systems. I think you'll want to follow his thread and pending resolution as well. I don't know how to post a link to that thread but if I figure it out I will.
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Old 10-01-2016, 11:35 AM   #7
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Pretty sure when I changed my Aqua-hot fuel filter, the old one wasn't filled right to the top. I've never had any issues with it firing up.
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Old 10-01-2016, 09:06 PM   #8
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I have the same problem I have been working on for a while with the low diesel light coming on, I am assuming that will not shut down the heater unless the diesel level is actually to low or my minor annoyance light just became a big pain in the a$%#$ that needs to be fixed now
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Old 10-02-2016, 05:34 PM   #9
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Any idea where the fuel pump is for the Webasto? I still cant get fuel to the unit. We have removed the unit, cleaned and changed filter and nozzle. But when I turn the two switches on for the heater and I can hear it cycle but no fuel makes to to the filter. I am at a loss here
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Old 10-02-2016, 05:57 PM   #10
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Is your low diesel light still on? I think when it registers low fuel it cuts off the fuel supply to both the furnace and the generator even if the tank is not actually full.


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Old 02-25-2017, 09:20 PM   #11
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Hey BootJack, Did you ever find your fuel pump location? I am now having the same problem. No fuel to the unit. I pulled both filters and mine are inline not screw on but the fuel line disappears into the frame rail and I did not find a pump to test yet.
Would appreciate a hint on where to start since following the line is difficult if not impossible
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