10/05/2026
Does your Transporter or camper sit for weeks at a time? There's a good chance diesel bug is brewing in the tank.
Modern diesel holds more water than the old stuff, and when a van only does a few thousand miles a year the fuel sits there for months. Condensation builds, microbes feed where the water meets the diesel, and you end up with black sludge clogging filters, blocking injectors, and leaving you stranded : usually on the way to somewhere good.
We're seeing more of it on Transporters and camper conversions coming through the workshop. Hard starting, flat power, repeat filter changes, black smoke under load. All classic signs.
The fix is straightforward if you catch it early. Left too long and you're looking at injectors, pumps, and tank work : not cheap.
If your van's been sat over winter, or mostly does short local runs, get it checked before the season starts. We'll inspect the filters, treat the fuel properly, and tell you exactly how to store it to stop it coming back.
Full breakdown on the blog 👉 https://highvoltgarage.com/diesel-bug-in-vw-transporters-and-campers-what-it-is-how-to-spot-it-and-how-to-stop-it/
Book a diesel health check: 0191 586 4148 or message the page.