Question about 2004 Chevrolet TrailBlazer
Changed fuel pump and relay
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Posted on Jan 02, 2017
are you using the original key ?? sounds wear but in the key switch there is a sensor that detects if the right key is in use otherwise it will kill the power to the fuel pump or it can be a fuse look under the left rear passanger seat there is another set of fuses and the other set of fuses are on the driver side near the door and there is another set of fuses and relays inside the hook next to the battery
Posted on Apr 01, 2009
SOURCE: No power leaving the relay
Are you testing the relay when the engine is cold?
The air injection pump works for a very short period of time during initial cold engine start.
Once the exhaust stream is warm enough to support O2 sensor function, the pump shuts off and will not come on again until conditions are met.
Let me know.
Posted on Apr 30, 2009
Well if theres power going to the relay but not out, then you need a new relay. If theres power in and out of the relay, you might need a new fuel pump. The electric fuel pumps inside the tank are actually lubricated by the fuel as it pumps it, and if it runs dry long enough, it can burn out the pump
Posted on Aug 03, 2009
Was the connector to the pump replaced? There is a factory bulletin to replace the connector. Also keep in mind the pump runs only one second unless the engine is cranking or started, the computer shuts it down otherwise.
Posted on Jan 30, 2011
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