I have air/fuel ... looks like more air than fuel, bubbling up the see through line from my old style primer pump to the big filter. Just a little non moving bubble in the first small filter. Do you think the pump is leaking in air? Or leaking in at that very hard to get at nut down there on the forward side of the pump, (can't seem to get hold of it to see if I can tighten it.
Would you just order a new new style pump if it was your car?

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Thanx,
Alberta Luthier
1983 300CD ('Stinky')155k miles, 2.47 diff, EGR removed, AAZ injectors with 265 nozzles from Sean,and vogtland lowering springs.
1984 300SD ('Old Blue')150k Klicks from Japan originally, came with rear head rests, no sunroof and never had an EGR

Yes, replace it with the new type. 99.99% chance it will fix the leak.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Agreed, the one there is pretty old. I used vice grips to remove, and a stubby open end to install the new one, make sure you use the copper crush washer.

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83 SD

84 CD

I believe that that nut you spoke of on the forward side of the pump is on the presssureized side of the pump and would leak fuel out if there was a leak.

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84 300D, 82 Volvo 244Gl Diesel

I thought I had read that the new style was better all around. And D911- what you're saying makes sense so the suction leak is probably in the primer pump. Add that to the parts list I guess

__________________
Thanx,
Alberta Luthier
1983 300CD ('Stinky')155k miles, 2.47 diff, EGR removed, AAZ injectors with 265 nozzles from Sean,and vogtland lowering springs.
1984 300SD ('Old Blue')150k Klicks from Japan originally, came with rear head rests, no sunroof and never had an EGR