Question about Cars & Trucks
When i turn my key the pump is not priming. I can pour gas in my carb and it will crank right up. It will stay running until i turn the key off, then must pour gas in the carb again to get it to crank. I have changed the relay and fuel pump. I can not figure out what is going on. someone please help
There is a problem with the fuel pump relay's wiring: What turns it on to prime the line to the injector is the computer signal to the coil side of the relay. This should happen when key is turned to on, about a 2 second signal from the computer. Then, when the engine is cranking, the computer should also signal the relay, keeping the pump on till running. After engine is running, the pump is kept on by the oil pressure switch.
Depending on how the wiring is set up for the relay, the computer will either send a signal to the coil side of relay, and coil side then goes to ground, OR computer may ground the coil side of relay, causing it to energize, and send power to the pump. Check for the computer signal to the relay. The power feed is there for the pump or else it would not be running. Something is wrong with the coil side wiring for the relay.
Posted on Nov 22, 2013
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Posted on Jan 02, 2017
I know that you want a simple answer but, have you done any troble shooting steps at the pump its self? when the relay is in does it pump at all? what is your lin pressure?
Posted on Jul 03, 2008
Check all the wire connection on the throttle body, the throttle position sensor may not be sending the proper signals to the ECM which controls the fuel injector. Here is a link to retrieving the DTC codes which i hope can help you get your serra running again.
Good luck and hope this helps. http://www.articlealley.com/article_48352_31.html
Posted on May 25, 2009
strip and clean carb sounds like the float is stuck or the needle valve is corroded and stuck,or the gauze filter in the carb inlet pipe has a spiders nest in it
Posted on Nov 11, 2009
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