Iíve been a Detroit muscle guy most of my life but always respected
what my father said was the best and bought a 450sl 80 about a year
ago. It had been sitting in a garage for a long time which had left it
prestine to look at but ran poorly. Replaced ignition wires, plugs,
distributor, injectors, and fuel pump. Cleaned the fuel distribution
box and the air intake body, new fuel filter and pump. And, of course,
re-set the timing. All this made an enormous improvement. It still
starved for fuel when you stepped on it, but only going up big hills.
The fuel pump was replaced with other than Borsch. I put the original
fuel pump back on and Bingo, its now back to being my fathersí
Conclusion: Not all fuel pumps are created equal.