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View Full Version : Please Help Does the diesel fuel system de-pressurize overnight?



battmiceter
20-10-2012, 08:28 PM
if left overnight will it be safe to change the fuel filter in the morning on my 2.0 tdi a4?

if not what is the best way to de-pressurize the system?

a8 tech
20-10-2012, 08:33 PM
yes but has a residual of around .50 bar to allow aid quick starting and you should be ok to change as soon as the ignition is off

in short

the system has a pre pressure pump for delivery to the rail and then the high pressure pump will increase on demand

you should prime the system after replacing to prevent the high pressure pump running dry

battmiceter
20-10-2012, 09:09 PM
thanks again a8 tech,

how can i prime it after changing the filter?

other than turning the ignition on and waiting for it to start?

Thanks