GM Truck Club Forum banner

Fuel issue

1126 Views 3 Replies 3 Participants Last post by  Revredneck
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
1 - 2 of 4 Posts
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.
1 - 2 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.