Quote:
Originally Posted by hatzie
84 wouldn't have Fuel Injection GM started that on the 1987 trucks.
The mechanical fuel pump will deliver fuel at the proper pressure for your carburetor from whichever tank you select.
Change the switch, check for volts and ground at the plug, and then check the old valve operation before you do anything with the new valve. A fair percentage of the time the old valve will work fine.
From 1981 on GM stopped using the AUX and Main designations and got right to the point LH & RH. You should make sure the LH tank is selected when the switch is set to LH and RH when RH is selected.
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Thanks for the info. The carb manufacturer recommends 5-5.5 psi, the pump is over that. I changed the switch to the one posted. Should I change to another one?