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Fuel issue

1124 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
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Not sure if this would have 2 different fuel filters, (one for each tank) but are all the equipted fuel filters new and clean? I belive that between then fuel pump and the sending units on those there is a rubber hose conecting the pump to the SU. Make sure that its not leaking or that it has a hole in it. Or that any possable rubber hoses in the system arn't kinked a little. Do both pumps also have new fuel strainers on them as well?

Hope this helps a little good luck!
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