1

These are from underside of Mercedes Sprinter close to fuel tank. One goes to the engine, the other to a diesel heater. I think they're too small to the fuel filters or pumps. What are they?

enter image description here enter image description here enter image description here

4
  • 1
    Diesel heater? Heats the diesel, or diesel burning heater for the cab? – HandyHowie Apr 19 at 7:52
  • Diesel burning heater for the cab and crew area. – Stewart Apr 19 at 9:44
  • 1
    Looks like the pump for an sloppy installed aftermarket cab heater. Do you have two heaters? – Martin Apr 19 at 9:55
  • @Martin Just the one heater. 2nd hand purchase. Trying to figure out how it works. – Stewart Apr 20 at 5:29
3

My guess would be that they are electrically operated solenoid valves for shutting off the diesel when the ignition is off. Looks a bit like this in a rubber mount -

enter image description here

Taken from - https://12voltfuelvalves.com/product/12-volt-multi-fuel-shut-off-solenoid-valve/

1
  • No way are those Original Equipment Manufacturer (OEM) components. Those screws on the heater and the orange wire bundle scream crappy aftermarket / owner add on. It sure looks like a solenoid, but why would someone add that? A pump would make a small bit of sense (say you wanted to run the heater when the vehicle is parked overnight) but that would certainly kill a battery pretty quickly. And that only applies to the aux. heater. Why touch the main fuel supply? Perhaps wacko antitheft application? – zipzit Apr 20 at 15:46
1

if I am looking at the parts you are talking about as you have not circled them, then they could be part of the fuel return system.

3
  • Do diesels have evaporative emissions control equipment? – HandyHowie Apr 19 at 6:51
  • @HandyHowie can you smell diesel when filling your tank? – Solar Mike Apr 19 at 6:53
  • That isn’t what I asked. I was asking if they have EVAP. I can’t find any references to EVAP in diesels. Do diesels have it fitted? All references I have found say that diesels do not need EVAP due to the high boiling point. – HandyHowie Apr 19 at 6:57

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.