How to prevent generator vapor lock
I have a Onan Gold 7000 generator. Runs fine normally, but sometimes when traveling in hot weather it develops vapor lock. When it happens, it has been when temperatures outside are above 97/98. We...
Forum Discussion
Just as a note- the higher the fuel pump sits from the fuel the greater the pressure drop and closer to vapor point the fuel gets. Heat makes fuel even less dense. One diagnostic would be to lessen the total lift of the fuel (fuller tank of fuel). If. the problem persists, a pressure gauge should test for pressure on the fuel out port of the pump.
A weak pump cannot supply fuel to a desired height. This is where a disconnected fuel pump volume test an be misleading so avoid doing it as step 1. Only a pressure check will reveal a weak pump. Then do the bulk flow test.
Way back "in the day" chassis engines used mechanical pumps. With a long rig and a steep hill the total lift increased beyond the ability of the pump. Electric fuel booster pump sales, thrived.
Pressure and fuel delivery specs need to be referenced to give fuel pump testing any value.
A weak pump cannot supply fuel to a desired height. This is where a disconnected fuel pump volume test an be misleading so avoid doing it as step 1. Only a pressure check will reveal a weak pump. Then do the bulk flow test.
Way back "in the day" chassis engines used mechanical pumps. With a long rig and a steep hill the total lift increased beyond the ability of the pump. Electric fuel booster pump sales, thrived.
Pressure and fuel delivery specs need to be referenced to give fuel pump testing any value.
