Mo Lee
10/20/2008 7:31:42 PM
Can anyone tell me what the symptoms are when you have a bad fuel pump relay? As I mentioned in another post, my Blazer will hardly start after sitting for 10 hours (like overnight). Once it does finally start it runs well. I learned that when you turn the key (but not all the way to crank the engine) the electric fuel pump is supposed to turn on for a couple seconds to inject the fuel needed to start the engine. I don''t hear the whirl of the fuel pump (in the
gas tank) for the 2 seconds (so the pump is not turning on for the 2 seconds that it is supposed to). Bottomline, what does the relay do and what are the symptoms when the relay goes bad?
Mo
Peru Motors
10/21/2008 4:07:45 AM
you''ll have to unplug the connector near your license plate light-there may be two connectors and take a multi meter or a 12 v test light and unplug the connector and see if you have 12v(or bright 12v test light) for the 2 seconds at key on-one of the other wires is the gas tank gauge which I believe is 6 volts(or half your normal test light brightness). If you have 12 volts for two seconds at key on your issue is to the rear, in other words pump or sending unit. I have a a couple (rare but possible) of Blazers with sender issues but this test should direct you somewhere and if it does this every day-you should be able to duplicate it. JP
