Had same problem as you
thought my pump will let me go soon
Added methylic alcohol, bout half a galon for a full tank.
What this alcohol does is clean the water deposits all over
the fuel system.
Pump runs normal after i poured some of this stuff in the tank

hope it helps

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1987 190E 2.3 (special lady)

Currently working on a 2.3 16v look conversion... It takes time