7.2 Fuel Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.2.12 Sequenced Batch Fire
These settings allow batch firing to be sequenced from a specific trigger number for repeatable phasing on each
start if you are running batch fire fuel with a sensor input mode that allows for wasted spark or coil on plug. As
standard, batch fire sequencing is "random" at the change from cranking mode to run mode. This setting forces
the sequence to always start on the same "trigger" on each startup. This can help if you are running batch fire
injection and you find the engine runs differently from startup to startup.
On an engine running wasted spark, the trigger numbers start at one and count up to half the number of
cylinders, with trigger 1 corresponding to the number one cylinder firing event. On an engine running sequential
coil on plug with batch fire injectors, the trigger numbers again start at 1 for the number one cylinder firing event
and count up to the number of cylinders.
7.2.13 Fuel pump and pressure
MS3Pro can both control fuel pump pressure and correct based on fuel temperature and pressure.
PWM fuel pump control requires using a solid state relay or other fuel pump control module to supply power
to the fuel pump. See section 4.11.1 for more information about solid state relays. The diagram below shows an
example of running a fuel pump from the MS3Pro using a solid state relay.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 163
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