BlkCat

Cheston posted this on his website, MaximaDriver.Com:

"Unfortunately, the way the Fuel Pump switch is set up, the aux fuel pump that comes with the kit does not kick in if you're not boosting. So when you're full boost, the pump is on, then when u let off the gas, the pump shuts off the pressure goes back down. But if u try to hit the gas again, the pump will not turn on until the pressure in the lines back down to normal levels and then the pump will activate and fuel will resume pumping, causing a "lag" and subsequent JUMP in power when it DOES come on. To fix this i removed the vac. line going to the fuel pump switch and plugged the vacuum line. Then the switch didn't know if boost was on or off, so the auxillary pump stays on now, full time, and no lag."

Has anybody else tried this?

My thinking is that if the auxiliary fuel pump is constantly on wouldn't we be pumping and burning more gas than usual, whether off boost or on. I hate the lag but I don't want to burn up the gas faster than usual.

Any thoughts on this are welcome!

MardiGrasMax

iTrader: (14)

The final fuel pressure is controlled by the FMU wich is a is a boost referenced fuel pressure regulator. The pump is just their to provide enough pressure and volume when under boost because the stock pump is wimpy.

So to answer your question you will not burn more fuel. A side effect may be that you fuel lines stay cooler because more fuel is being circulated in the fuel line's, but that is a good thing.

OgreDave

iTrader: (1)

another side effect is the noise from the fuel pump

BlkCat

and I've noticed the improved response to the pedal now and that's without Don's VB mod. I disconnected the vacuum hose and plugged the hole with a yellow golf tee. Capped the hose connection to the auxiliary fuel pump. I do recommend this slight mod. I can't imagine what the VB mod will feel like once I get it in the mail!
As for fuel pump noise...nothing has changed which is a good thing!