Mallory Ignition ACCEL DFI PRO RAM 77141_77142_77143_77144 User Manual
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Select the ignition type in the Systems screen under IGNITION TYPE
SELECTION.
FUEL PUMP MOUNTING.
The most important component of the high-pressure fuel system is the fuel pump.
The location and mounting of the pump is critical. The pump must be located at
the rear of the vehicle near the tank at a point below the fuel level in a protected
area. It can be mounted using a special fabricated bracket or with an ACCEL fuel
pump mounting bracket that is supplied.
The fuel pump requires a 12-volt source. If your vehicle already has an electronic
high pressure fuel pump, you still MUST connect the +12 VDC side of the fuel
pump to the
ACCEL main harness (red/black wire). The +12 VDC comes from the fuel pump
relay via the red/black wire in the main harness. The pump draws up to 30 amps
of current depending on size and fuel system pressure; the ground can be
connected to any clean, paint-free point on the chassis. Route and secure the
wiring from the pump into the engine compartment so that it does not hang below
the vehicle, interfere with rotating parts or become exposed to excess heat.
There seems to be a misunderstanding that a fuel pump “produces pressure”.
This is wrong. What actually happens is the pump produces fuel flow at a given
system pressure which is maintained by the pressure regulator. The pressure
regulator is a dynamic modulating devise, which regulates the fuel rail pressure
by either restricting or bypassing fuel back to the fuel tank.
MECHANICAL PUMP REMOVAL
Bypass or remove the mechanical engine driven fuel pump.
Cap the fittings or block off the opening to prevent leakage.
Mr. Gasket block off plate part number 1516 can be used to on a Chevy SB/BB
to do this.
HIGH PRESSURE FUEL FILTER MOUNTING
The high-pressure fuel filter (5 to 20 Microns) should be located between the
outlet of the high-pressure fuel pump and fuel rail. It is recommended to place a
fuel filter/strainer (100 Microns) between the fuel tank outlet and pump inlet.
Connect the filter to the fuel line using the ACCEL fittings supplied with the
system.
HIGH PRESSURE FUEL LINE INSTALLATION
The system comes with a high-pressure pump and fuel filter. These must be
used in conjunction with either 3/8” S.S. braided line or hard tubing to route the
fuel line from the tank outlet to the fuel rail inlet.
At this point, the high-pressure circuit of the fuel system can be plumbed. If the
existing fuel supply line cannot sustain 150-PSI pressure, then it must be
replaced with high-pressure fuel line/tubing. Remember that a carbureted system
operates at 6 PSI. Never take any chances. If in doubt, replace the hose. Use
only 3/8” diameter double braided stainless steel high-pressure gasoline hose
such as Mr Gasket Shadow Series or equivalent. Use this exclusively to connect
the fuel pump and filter to the balance of the fuel system along the entire length