Mallory Ignition ACCEL Digital Fuel Injection Engine Management System 74030 - Manual (Page 23)

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ACCEL/DFI
A) All electrical and mechanical connections are made
securely.
B) There are no fuel leaks.
C) The fuel feed line is pressurized with fuel. The most
common problem is the fuel pump is wired backward.
On the ACCEL pumps, the positive (+) and negative (-)
designations are casted in the pump adjacent to the
terminals. If the ACCEL 74702 pump is wired
backwards, it will run backwards.
D) Ensure that the engine timing is properly set.
XI. OPTIONAL ITEMS
(1) User Interface Module (UIM, part number 74500)
This option allows the driver to change the three
dimensional fuel table while the engine is running. The
UIM contains two potentiometers for increasing or
decreasing the amount of fuel supplied to the engine during
idle and WOT. The idle potentiometer provides the user
with the ability to increase or decrease the amount of fuel at
idle and part throttle by 10%. The WOT potentiometer
comes into play only when the throttle is fully opened. The
percent increase and decrease is 25%. The UIM does not
change the amount of fuel delivered during cranking.
The UIM must remain connected to the main wiring
harness after adjustments are made to the ECM. If it is
disconnected, the ECM will automatically default back to
its preset values.
If your engine requires a somewhat different calibration
than is noted on the ECM or you are calibrating a unique
engine combination, use the ACCEL DFI Serial