Losing Power at Speed
Thread Starter
Junior Member
Joined: Jun 2007
Posts: 23
Likes: 0
From: San Diego County
1980 MBZ 300SD, 03 Audi A8, 97 Volvo 960
Losing Power at Speed
I just got a nice 113k mile 1981 300 SD. It sat for a bunch of years but it runs well except when I try to get on the freeway. Sometimes it goes fine, other times it will not accelerate past 50 mph. I just purchased the car from a dealer-not a MB dealer- who changed the fuel filters. I notice in the little plastic one that there is a lot of AIR instead of fuel. So ,my questions are these: Could it be that he did not bleed the fuel filters properly and that would cause this? or is this a classic sign of a bad fuel pump-like it would be in a gasoline engined car. OR, is it something else entirely.
All suggestions welcome.
Thanks!
All suggestions welcome.
Thanks!
Banned
Joined: Apr 2006
Posts: 1,116
Likes: 5
From: Federal Heights, CO
1982 300D VNT, 1980 240D 3.0T, 1982 300TD
A single air bubble in the small filter is fine as long as its not a stream of bubbles.
Take care of the basic maintenance. Valve adjustment, accelerator linkage adjustment, clean air filter, make sure the primer pump does not leak when pumped, and check for dragging brakes.
Take care of the basic maintenance. Valve adjustment, accelerator linkage adjustment, clean air filter, make sure the primer pump does not leak when pumped, and check for dragging brakes.
Thread Starter
Junior Member
Joined: Jun 2007
Posts: 23
Likes: 0
From: San Diego County
1980 MBZ 300SD, 03 Audi A8, 97 Volvo 960
I just got a nice 113k mile 1981 300 SD. It sat for a bunch of years but it runs well except when I try to get on the freeway. Sometimes it goes fine, other times it will not accelerate past 50 mph. I just purchased the car from a dealer-not a MB dealer- who changed the fuel filters. I notice in the little plastic one that there is a lot of AIR instead of fuel. So ,my questions are these: Could it be that he did not bleed the fuel filters properly and that would cause this? or is this a classic sign of a bad fuel pump-like it would be in a gasoline engined car. OR, is it something else entirely.
All suggestions welcome.
Thanks!
All suggestions welcome.
Thanks!
