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to eliminate the fmu you will need some bigger injectors and a custom tune.. instead if a 255, install a -8 siphon tube and an external pump such as an areomotive a1000, wire it using a separate relay and the factory harness as a trigger.
To repair a wire problem, start at the fuse and work your way to the relay and then the rear bulkhead thru connector and look for damaged or faulty parts. if everything is in order, the ecm may be messed up and not turning the fuel pump on for the initial 2 sec prime. but if you got it to work intermittently it is most likely a problem with the wiring to the pump or the realy, fuse, etc.
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