Join Date: Jan 2011
Location: Sugar Land, TX, USA
K75 Fuel delivery problem
I am a new member and this is my first post. Bought a non-running 1987 K75 yesterday to resurrect and accompany my other German machines (BMW R80 Airhead and 72 911 EFI 2.7L).
According to the previous owner this bike has not run in 3 years. At that time the bike simply stopped running while going down the road. So far, sparkplugs fire but there is no fuel pressure. There is no elect resistance across the + and - on the fuel pump (i.e. potential short)... with key on only, no response from pump and no elect signal to pump... with key on and starter turning 10 volts measured on pump terminals but unable to hear pump due to sound from starter. Jumped 12.8 volts (from separate power supply) across pump and pegged amp meter at 8 Amp max/limit momentarily while hearing the dreaded buzz from pump. I assume the pump is toast but want to know for sure before replacing it.
Will appreciate input from members familiar with kbikes:
Is it common for the fuel pump to fail? (stop abrubtly while riding)
Are there other tests to perform to confirm pump is bad?
Any tricks on reviving the existing pump? (shock it, disassemble it, pressurize it)