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Espar B4L Heater not starting at Elevation

37455 Views 322 Replies 60 Participants Last post by  brío
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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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.
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