Dang thing has a ball that moves freely, but for some reason the check valve doesn’t check either way. I don’t know if fuel is flushing around it or it’s a bad valve. Disappointed, but knowing this is an issue with the IP, I simply know “it’s not a good IP” at this point.

I did one last compression test and put the old spark plugs back in and connected the injector lines to keep junk out of them.

I removed the fuel pump rig and am now going to move onto my 250se hoping I don’t have the same kind of problems with it.

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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,