Page 1 of 1
Possible underside leak?
Posted: Tue Dec 30, 2025 9:38 pm
by BromGo
Hi there - strange patch on the driveway, about 2m from front of Bongo towards rear, pretty central. What are the possible culprits? Petrol? Wouldn’t have thought petrol could slow leak but maybe with temperature fluctuations.
Water spots near front wheel and rear normal, but central I’m confused.

Re: Possible underside leak?
Posted: Tue Dec 30, 2025 10:05 pm
by g8dhe
You probably have the undercover on, this has an escape hole in that position so the fluid can becoming from anywhere under the engine bay but only leaks out in that position to fall on the floor! You need to sample the fluid that has appeared for colour and texture and then compare with the engine coolant, oils used in the vehicle to identify which source it is from.
Re: Possible underside leak?
Posted: Tue Dec 30, 2025 10:20 pm
by Bob
Spot on from Geoff, a tray and some newspaper can help.
Re: Possible underside leak?
Posted: Wed Dec 31, 2025 11:17 am
by BromGo
Thanks both; I’ll get a tray under there this week
Re: Possible underside leak?
Posted: Wed Dec 31, 2025 12:10 pm
by g8dhe
The other thing to bear in mind is that it can be a mixture of everything that has dripped from the engine since it left the factory as it has a "foam" layer to hold drips! I have taken the undercover off mine and hosed it down with detergents in the past but finding a suitable bit of waste land to do it on with a hose can be interesting! Its best to put the cover back on afterwards as it also acts as a sound barrier for road noise coming up thru the engine bay.