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This may be a case if it aint broke dont fix it . i have a 1988 p30 454 original gas tank and pumps of course . it has 2 fuel filters the one near the engine i change regularly the other one in the hard lines under the chassis i cant figure out how to change . it had of history of occasionally running slow on the freeway but i put seafoam in it every fillup and that has stopped . my question is should i go to the trouble of changing this system out to keep crap out of the engine . its amazing the fuel pump is still apparently working . what upgraded filter should i use and should i worry about the one i cant change .
Gm made numerous changes to their fuel systems during the 80's to reduce vapor lock. I was never a fan of the intank pumps and tiny filters they used. Here are some changes I made.
An evolutionary process but final result was pretty reliable. The final solution was the fuel injection system.
OTOH, if it ain't broke... don't fix it. Be sure of clean fuel, mind your filters and you should be OK. Good luck
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 300 hp
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