View Single Post
Old 08-22-2017, 03:29 PM   #3
ChevyTech
Registered User
 
Join Date: May 2004
Location: Minnesota
Posts: 4,620
Re: One more question about disabling fuel pump

Unplugging the fuse is better then unplugging the relay.

With the relay unplugged a redundant circuit that goes through the oil sender will supply power the fuel pump once the engine gets around 4 PSI of oil pressure. If you crank it long enough it should get enough pressure to make the pump run after some time.

Unplugging the fuse stops power from getting to the fuel pump. This will most likely set a trouble code 54 in the computer. The code is easy to clear and will clear its self with time.

Some people just unplug the injectors but if you do that be careful because the plastic may be very brittle and the tabs may break off.

Disable the ignition also.

The suggestion to use a push button starter switch for testing compression is the better method.
__________________
For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
ChevyTech is offline   Reply With Quote