Not sure what Webasto heater is in the 8 but the cab heater type i have is an Airtop 5000. You can hear the fuel pump clicking when it's running. If it's not been run for a while it can take a few fire ups for it to actually start up. There is a filter in line too somewhere i would have thought. If it had the Webasto thermostat it flashes a fault code that relates to the problem. I downloaded a load of stuff for it from Butlertechnik, service, parts, fitting instructions ect
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8.
Bright yellow bus o love.
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