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View Full Version : Temporary Fuel Tank Leak



OldAudiA4
11-10-2018, 06:09 AM
If I don't drive my car for a couple of weeks and start it, there is a significant amount of petrol leaking out of the tank and dripping down onto the ground (creating a puddle). If I drive it around for 10 minutes, it stops. If I drive my car consistently, the leak doesn't occur but let it sit for a couple of weeks and the leak temporarily comes back again.

What could it be?

A cracked hose that is remedying itself? Something to do with air pressure building up in the tank?

OldAudiA4
11-11-2018, 11:31 PM
bump

pkfinn
11-12-2018, 01:25 AM
I wouldnít think it should be too hard to find the source of the leak if itís leaving a puddle. Pull the access plate off for the fuel pump and see if itís wet in that area. If not, follow the lines and see if theyíre wet.

OldAudiA4
11-12-2018, 01:28 AM
I wouldnít think it should be too hard to find the source of the leak if itís leaving a puddle. Pull the access plate off for the fuel pump and see if itís wet in that area. If not, follow the lines and see if theyíre wet.

It's got me puzzled though how it remedies itself, which leads me to believe it's something to do with pressure build up in the tank and it's related release mechanisms.

pkfinn
11-12-2018, 01:34 AM
It's got me puzzled though how it remedies itself, which leads me to believe it's something to do with pressure build up in the tank and it's related release mechanisms.

Agreed, but knowing where itís leaking from might help figure that out. You could leave the gas cap off while itís parked to prevent any possible pressure build-up and see if that makes a difference.