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Espar B4L Heater not starting at Elevation

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So I installed a Espar B4L in my 2020 transit, under the passenger seat and have a problem with the heater starting when I am at elevation.

I live in Boise ID, at around 3k feet elevation, when down here in the valley my heater starts 99% of the time without issues. When I travel to my local ski area around 6800K feet the heater NEVER starts first try and generally will take around 30+ minutes of trying to get the thing started. Once it does starts at elevation, it will run absolutely fine stopping and starting. When I got back down in elevation it also will always start fine, and then back up to elevation I again have the problem.

Ive completely taken apart the entire gas line from the pickup in the tank all the way to the heater, ensuring rise, fittings, etc are perfect... still have the same problem of getting it started at elevation.

Heatso has been sorta OK to work with, but I feel like they dont really know either. They will be sending me a new ECU (when they get them in a couple weeks).

Has anyone had this problem, is there a trick to getting it started I could use until i get the root cause sorted?

Appreciate any pointers!
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Discussion Starter · #4 ·
I think there are many more. Spend some time with the much distained search function on this site.
Quotation marks around individual words. Please post back your action/results when you solve the heater problem.
Thanks for your helpful comments, I needed a lesson on how to use basic search parameters :rolleyes:.. I have read every single post on this site about heaters.
 

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Discussion Starter · #6 ·
How low do you let your tank get while driving? I've found that the Ford factory fuel line will be above the fuel level when the dash says about 1/3 of the tank. If that happens the standpipe will fill with air and the whole fuel line will need to be purged. On my Webasto it's 2-3 full system restarts to get all the air out, but once it's running it will continue running just fine. Basically anytime I let the tank get below 1/3 tank I expect to need to do multiple restarts to get the system running.
Good question, as I have suspected this as well. I have intentionally kept it over 1/2 at all times to try and reduce this issue and still have the problem.
 

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Discussion Starter · #11 ·
@DrkGrn Yeah - Ive cleared the errors, done factory resets, etc before going up in elevation, and still have the problem. Always get a spattering of error codes after trying to start it at elevation. Yeah it was suppose to be the new model that "just works" at elevation, thats exactly why I spent the extra money on this one :)
 

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Discussion Starter · #12 ·
Not sure if it'd be related, but according to the guy at Esparparts.com you need this standpipe when using the B4L on the transit:

@Muggydude thats insanity if its true, but I suspect its not. If it were a standpipe issue I would assume I would see this issue regardless of elevation.
 

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Discussion Starter · #28 ·
A slight update to this issue:

It dawned on me that when I first installed my heater and went to elevation, it would always start after 1 or 2 attempts. In my quest to get it to start EVERY time, I dissembled the fuel line, reassembled, etc, but I also adjusted the fuel pump angle, increasing it to probably at least 30 degrees.

After these changes the heater for sure would take at least 6 or 7 times for it to start. I readjusted the fuel pump to be probably closer to 15 degrees, and tested it while skiing this evening and it did fire back up after one failed attempt, which is far better than the 6 or 7.

I have plenty of other trips planned in the next week in similar elevations so I will continue to report back. But I am curious if others tried adjusting the fuel pump angle if they had better luck?

Still dumb it doesnt start first try, but I am determined to get this sorted.
 
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