Originally Posted by
mearstrae
But why run a mechanical pump if you have an electric one? That seems to be asking for trouble with the mechanical pump.
109's with rear fuel tanks came from the factory with electric and mechanical fuel pumps in-line. In extreme nose-up attitudes, the fuel tank could be too low for the mechanical fuel pump's suction to draw fuel, so they added an electric boost pump to eliminate this problem.
--Mark
1973 SIII 109 RHD 2.5NA Diesel
0-54mph in just under 11.5 minutes
(9.7 minutes now that she's a 3-door).