Ford Transit USA Forum - View Single Post - Webasto Air Top 2000 STC PETROL (GASOLINE) won't start
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post #9 of (permalink) Old 01-09-2017, 04:56:PM Thread Starter
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Originally Posted by Johnnydanger View Post
You might want to try setting it for high altitude (or vice versa). There's a sequence you do after grounding out a pin on the harness near the heater. F02 is normally thrown when there's air in the line. It's quite possible that the heater is set for a different altitude than you've been operating at. That could explain a cold vs warm issue. Also, I'd triple check your fittings and make sure there are no air leaks on the intake or exhaust. Might also behoove you to remove the intake and exhaust silencers and see if that returns it to proper form.

The fact that you can get it to fire after draining the line and then reconnecting sure sounds like an air bubble related issue to me. I have F02 semi-often because I made the mistake of using a ~6" section of 5/16" line right out of the tank before stepping it down to the small diameter webasto line. I'm 99% sure that due to the large fuel line diameter and the step down that an air bubble/empty line issue forms there which has to purge if I don't run it regularly and the line drains back into an emptyish tank. Usually 2-3 restarts clears it and all is good. I did have an issue during my recent California trip where the heater would run for 30 minutes and then fizzle out. Consistently. I was worried about the burner being plugged up or something, but it turned out to be a tank of gas that the heater didn't like. Old gas station in Garberville. Maybe some water, or fuel that was over winterized. After running the tank down and filling fresh it worked like a champ for the rest of the trip.

Lastly, you ended up using the aux port on the fuel tank, yeah? If so, make sure that you have half a tank or more of fuel. Below that you'll be sucking air as the aux port doesn't run to very low in the tank.

Hope you get it figured.
Thanks for your input.

I bypassed the aux port by pumping from a clear jerry can. There was no bubble and the problem remained.
I'm at sea level, so the heater should not need altitude adjustment; unless there is a problem with the heater...

I just visited my local Webasto Tech. They could not read the diagnostic codes; there was just no communication between the heater and the computer. They blamed it on the European heater (STC). They checked my installation and it is correct. They think it might be the difference in european vs american fuel (different octane level), but it's just a guess. 2 hours later (250$), no progress. It was my decision to install it myself, so i'm ok with some repair cost. But about that European thing (STC), i'm a bit frustrated that the info is not available anywhere. It does says "Worldwide support 2 years" and approved Webasto sellers ship them to america... I would still go the DIY way, but i would buy the "ST" in lieu of the "STC" if I had known before.

I will have to send the unit to U.K. for proper diagnostic. I expect around 100-200$ shipping cost...

(issue: the heater will fire-up only AFTER the shutdown (abort) sequence has started. too late...)

To be continued...

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