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DannoXYZ · August 27th, 2021, 12:06 PM

After initial prime, ECU only turns on pump when it sees engine spinning.
This behavior comes out of FMVSS-108 regulations in 1992.
You don't want to be trapped inside flipped over vehicle after crash and have petrol-pump continue to merrily pump fuel from ruptured lines onto hot-exhaust until tank is dry...

How does ECU know engine's spinning???

Also measure resistance of IAT at room-temperature and boiling at ECU connector. This sensor being disconnected will prevent ECU from starting engine. Very common to have left off after replacing air-filter.

Measure state of tip-over sensor.

Get service-manual. Follow all procedures for measuring & testing sensors to a T. Somewhere along way you'll find fault and fix it without replacing single part.

August 27th, 2021, 12:06 PM	#8
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	After initial prime, ECU only turns on pump when it sees engine spinning. This behavior comes out of FMVSS-108 regulations in 1992. You don't want to be trapped inside flipped over vehicle after crash and have petrol-pump continue to merrily pump fuel from ruptured lines onto hot-exhaust until tank is dry... How does ECU know engine's spinning??? Also measure resistance of IAT at room-temperature and boiling at ECU connector. This sensor being disconnected will prevent ECU from starting engine. Very common to have left off after replacing air-filter. Measure state of tip-over sensor. Get service-manual. Follow all procedures for measuring & testing sensors to a T. Somewhere along way you'll find fault and fix it without replacing single part.
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