I'm thinking without the roller it was getting minimal movement and barely supplying fuel.

This the lack of return flow.

I inspected by hand and the plunger moves all the way and I can hear fuel getting moved.

I transferred the roller from my old pump. Now it should be good.

Haven't tested yet though.

Will keep this updated.

__________________
1983 300CD Turbodiesel

Does Bosch sell the lift pump parts?

I wonder if the roller can be ordered so I can revuild my old one and have it complete.

__________________
1983 300CD Turbodiesel

If there was a roller missing, it might be a good idea to check the cam that operates the pump for damage. If it is scored or gouged from the lack of a roller, it will destroy your new one in very short order.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

How do you check?

Just reach in and feel?

__________________
1983 300CD Turbodiesel

OK

How about a picture? There were two basic lift pumps at one time, one with a plain plunger for the NA motors, and one for the turbo.
An inspection mirror with a light would be good to look at the drive cam inside the IP.


snapped_bolt

__________________
'81 240D For now, a good place to borrow new parts
'80 300TD Probably will be put back into service!
'79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal....