What a pain! I replaced 1, that is 1 mechanical fuel pump that was 30 years old last summer, the original Carter pump on my '88 4.3 finally started leaking a bit of fuel in the yellow overflow hose to the carb. I actually have considered getting a reman old style 4.3 V6 engine when the time comes instead of new just because...I can still use a mechanical fuel pump! The new style vortec engines have no provision for the trouble free mechanical fuel pumps, alas.
I'd do some electrical checks in addition to cooling checks to make sure that bad terminals are not causing excessive heat and current draw. I think marine pumps don't last as long as auto pumps (and I've had auto pumps last longer than 20 years), the fuel pump in our '98 Jeep is original, 22 years old and counting! The reason is that auto pumps can push fuel from the fuel tank forward but marine pumps have to suck it forward, which puts more of a strain on them. Make sure you check for any restrictions on the suction side such as the anti siphon valve on the fuel tank and the fuel tank vent.
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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