Belt Drive Fuel Pump: First step in converting to alcohol fuel
Words and photos by Jok Nicholson
This time we are getting everything ready to install the Barry Grant
Fuel System belt drive fuel pump and related components. After several
discussions with the tech support people at Barry Grant we came to the
conclusion that the belt drive fuel pump would be the best way to handle
fuel delivery to the 540-inch Indy Cylinder Head Bracket Master engine
and the new King Demon alcohol carburetor.
The design of the BG Belt Pump makes it a logical choice for about any type of drag car. There are two different gear sets and two different set of wear plates for the pump. This allows a racer to change pump output while using the same fuel pump housing. This means the same basic pump can be put together as a 400, 500 or 700 series pump.
The main reason for the belt drive conversion is to manage fuel pressure
and take some load off the battery and charging system. The system we
are getting ready to install will give us 3 to 3.5 pounds of fuel pressure
at idle and slow engine speeds. As engine speed increases the belt pump
is spun faster and fuel pressure goes up accordingly. The BG Bypass
Pressure Regulator controls this increasing pressure by metering how
much fuel is returned to the fuel tank by the Bypass Regulator. We will
adjust the maximum fuel pressure when we get to the track; we will set
it at 10 to 10.5 pounds at the finish line. This higher pressure is
necessary to keep the fuel bowls full since an alcohol-fueled engine
requires twice as much alcohol as it does gasoline.
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