August 27th, 2021, 12:06 PM
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#8
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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
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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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