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New fuel pump won't pump

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Old 02-19-2012, 06:23 PM   #1
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New fuel pump won't pump

I've got a 2000 Tacoma that I just replaced the fuel pump in. I can hear the new pump come on, but it is not pumping fuel. I have taken the fuel line apart just outside of the tank and tried to turn the engine over. When doing this, I do not get any fuel coming out of the line. I tested the pump prior to installing it, so I know it was getting power. I did not submerge it in fuel to see if it actually pumped though. I connected the wires correctly to the pump (according to the directions that came with the pump) so it is not running backwards. What could the problem be?
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Old 02-21-2012, 05:43 AM   #2
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I hadn't thought about the pressurization. When I took the fuel filter off after trying to start it a bunch of times, there was no fuel in it, or in the lines for that matter. I'm not sure how long it takes to get fuel from the tank to the engine, but figured it would have been there by now. Thanks for the tip.
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Old 02-21-2012, 05:54 AM   #3
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I'd disconnect the line at the filter and hook the pump direct to a 12V source until the fuel comes out the line. Then do the same at the fuel rail (if possible).
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Old 02-21-2012, 06:08 AM   #4
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did you check for plugs or cap at the inlets of new pump ? sometimes they seal them off at factory so shit doesnt fall in there, you say its running & does it stay running ? i dont know anything about a 7th injector but even if you run the tank dry it only takes a few sec. for the system to pressurize, I dont think running that pump dry is a good idea pretty sure the only thing that lubes the impeller is the fluid going thru it
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Old 02-22-2012, 05:20 AM   #5
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Well, I was running out of time (and patience) so I had to take it for a mechanic to look at. They drained the fuel, dropped the tank and did some trouble shooting. Turns out the pump wires were hooked up backwards so it was running in reverse. The thing is, they were hooked up how the directions said to, which was opposite of how the orignial pump was wired. Sooo...the bad wiring directions/diagram ended up costing me. The pump was from NAPA too. I would expect that sort of stuff from Autozone, but not NAPA!!!!
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Old 02-22-2012, 05:21 AM   #6
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NAPA and Autozone don't write the instructions for parts. If anything, they pay to have their there name on the box.
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