We don't know what else it could be? 1988 Chevy 2500 will not run.
We have changed the fuel filter, ECM box checked the tbi injectors. Put tester on the fuel line go to fuel pump reading 5 psi. Fuel pump does not run with the key on, only pumps when cranking. Changed the fuel pump relay, the distributor module, will run with starting fluid.
5 psi is low, Fuel pressure should be in the 30-40 psi range.
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