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1993 Buick Roadmaster keeps on blowing fuel pump/ecm in-line 20 amp fuse. Car stalled out in a parking lot, would not start, no fuel. Changed fuel pump, fuel filter, fuel pump relay. Found fuel pump/ecm in-line 20A fuse keeps on blowing when I turn key on. Looked all over for shorts, disconnected oil pressure/ fuel pump cutoff switch, changed fuel pump relay, fuel pump is disconnected at tank at present, still blows fuse. Please help as I cannot afford to take car to shop and presently working

Posted / edited by AnonymousUser on : 15-07-2019

Answers :

You said the fuel pump is disconnected at present and the fuse still blows so I am thinking you have a dead ground in the fuel circuit maybe a wire is pinched after the fuse and before the pump. Check along the frame for this and make sure all of your ground wires to the engine and body are good.
Sorry to say it could also be a faulty ECM. The ecm uses circuit boards to provide grounds to a bunch of components and can short out internally.
Most of those components can fail and cause the same problem by causing a short "thru" the ECM. Things like injectors, O2 sensors, and so on.
I doubt you will find the problem without a book and some test equipment.
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