1 Too Much Fuel... why? Tue Mar 22, 2022 12:35 pm
Chris4n6
active member
TL;DR aka Quick summary: With fuel pump unplugged, bike fires right up and runs for 5 seconds or so. With pump plugged back in, it just sputters occasionally. Too much fuel. Why?
The whole story:
My son and I are working on a 1991 BMW K100LT. It has 70k miles and has been sitting outside for the last 10 years.
The head had to come off because the intakes and cylinders were filled with dirt and corrosion. Everything was put back together (without exhaust and radiator) to see if it would run. It started right up. It wouldn't idle on it's own, but success!
We put the radiator and exhaust on, and initially it started right up and ran for a few seconds (with fuel pump accidentally unplugged), but once the pump was plugged in, will only sputter, but not start... If I unplug the fuel pump it will run for a few seconds. So it's evidently getting way too much fuel.
Where do I start?
Some thoughts:
-Temp Sensor
-Throttle Position Sensor
-Fuel pressure regulator
-Are there other things that regulate fuel quantity?
Other info:
Injectors are new. They are knockoffs from eBay, because the original ones were totally trashed.
https://www.ebay.com/itm/132334916168
YT Vid with our progress pre radiator and exhaust reinstallation:
https://youtu.be/TRTj-RfsbtE
The whole story:
My son and I are working on a 1991 BMW K100LT. It has 70k miles and has been sitting outside for the last 10 years.
The head had to come off because the intakes and cylinders were filled with dirt and corrosion. Everything was put back together (without exhaust and radiator) to see if it would run. It started right up. It wouldn't idle on it's own, but success!
We put the radiator and exhaust on, and initially it started right up and ran for a few seconds (with fuel pump accidentally unplugged), but once the pump was plugged in, will only sputter, but not start... If I unplug the fuel pump it will run for a few seconds. So it's evidently getting way too much fuel.
Where do I start?
Some thoughts:
-Temp Sensor
-Throttle Position Sensor
-Fuel pressure regulator
-Are there other things that regulate fuel quantity?
Other info:
Injectors are new. They are knockoffs from eBay, because the original ones were totally trashed.
https://www.ebay.com/itm/132334916168
YT Vid with our progress pre radiator and exhaust reinstallation:
https://youtu.be/TRTj-RfsbtE