If it doesn't feel like it is pushing any fuel, it probably isn't! Watch the primary filter while pumping. The fuel should "slosh" a bit.

Unscrew the top of your pump and crank the engine over. Leaking fuel?

Regardless, get the newer style pump and pop it on there. From memory a 15/16" crowfoot is your best friend for removal, and a 17mm(?) to install the updated part.

Jay.

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On the road, currently:
'83 300D (German spec.) 168k mi. - - Wolfgang (tucked snugly away for the winter!)
'87 300D 375k mi. - finally went over to "The Dark Side"
'87 300TD 225k mi.
Cannondale 66cm CAAD5 w/Campy/Jamis Aurora
Hujsak Custom Fixie/Landshark Track Shark Custom/Ahearne Custom 29'er