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Re: Mark's 51 Build
you will want a different tank, the 03 s10 was a one year only for evap control. it actually has a shuttle valve in the filler neck that lets the gas tank seal completely when sitting still. if you block that vent, you wont be able to put any gas in, the shuttle valve wont move because the tank wont have any way to release the pressure from adding fluid and displacing air, so the shuttle wont move, and you will have gas all over your feet and not in the tank.
your current pump wont work on an older steel tank either, I cant remember which direction is which but one is shorter than the other, so either you will run out of gas with a 1/4 tank left, or the pump wont fit down in the tank. one is worse than the other.
the flex fuel 2.2 (99-02) S10 trucks had sequential fuel injection so the fuel pump was actually stronger than the 4.3 trucks of the same era, high gph and ~63psi capable. if you found one of those tanks and pumps it would work with your silverado engine.
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