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Fuel issue

1126 Views 3 Replies 3 Participants Last post by  Revredneck, 
B
I have a 1988 Chevrolet 3500 with a 454 and when you switch from left tank to right tank truck engine leans out...i have personally changed both pumps ( 1 in each tank) i have changed the switch valve and the switch in the cab, new lines from tanks to switch valve and for the heck of it i just changed the right tank pump again. The reason i know it leaning out cause you can hear the difference in the motor when switching and while watching my scanner i can see block learn(145) going up and the integrator staying low(128) on the right tank and the block learn and integrator matching on the left tank.....any ideas?

Thanks ...Bruce
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B
Fuel strainers in both tanks are new..fuel line from tanks to fuel switch valve new, there is 1 filter and its a common filter that is after the fuel switching valve.

Not sure if computer tied in to fuel tank switch or not...these computers back then where so primitive.
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