Originally Posted by
RedHeartbeat
did you put too small of a pump in there and now its running lean? Have you checked the fuel pressure? The worst thing you can do to a good tune is make changes to the engine or fuel delivery.
If it was fine before you swapped the pump, you may be the variable that affected the tune.
How did you power the pump? The factory fuel pump wire cannot carry the load of a performance pump and it surely can carry the power load of the factory plus a booster pump.
its a msd inline pump. it has its own relay on it. i did tap into the gray wire on the hardness so the pump will turn on with the stock pump. but the pump is power from the battery with a 12gauge wire. relay is next to the pump. when he did the retune i was not losing pressure anymore. due to the fact that it was leaning out after 5,000rpm. cause i was losing pressure.
2000 gmc, 5.3, 220/224 comp cam,918 springs&harden push rods,long tubes,polish throttle body, 39lbs injectors,msd inline fuel pump,msd spark plug wires, 150shot, 3500 tci,servo,3.90w/eaton posi,m&h drag tires, tune by flaco,still need to re tune for fuel upgrade.
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