Mazda 323,Mazda 626 & Mazda 929 Whether the compact 323, the mid sized 626, or the full sized 929, these vehicles remain very popular even though production has stopped.

'90 323 Fuel pump running, but not pumping

  #1  
Old 12-06-2015, 06:15 PM
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Join Date: Dec 2015
Location: Oregon
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Default '90 323 Fuel pump running, but not pumping

Like the title says, I'm working on a '90 323 hatchback. Not sure how many miles. Manual transmission.

My friend said it was sluggish, then it refused to start the next time. It cranks, has good spark, but no fuel. All fuses I can find look good.

When I open the drivers door I can hear the pump run (un-evenly) for ~5 seconds. (It is supposed to prime the pump when the door is opened, right?)

I opened the return line on the intake and I don't have fuel there.

I took out the back seat and put another line on the output directly from the pump, and again I don't get fuel when the pump is making noise.

So I swapped in a new pump, and it does the same thing

I searched, but did not figure out where the fuel pump relay is on this thing. My only other next step would be to jump power directly to the pump to see if it starts moving fuel or not.

Any ideas why two different pumps would make noise, but not actually push any fuel?
 
  #2  
Old 12-08-2015, 10:50 PM
tanprotege's Avatar
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Join Date: Jun 2011
Location: Midwest
Posts: 2,390
Default

Maybe there is not enough voltage arriving at the pump or the ground connection is corroded? That's really a guess.
 
  #3  
Old 02-07-2016, 12:32 PM
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Join Date: Jul 2013
Location: NW California
Posts: 23
Default a guess

fuel line plugged at the tank or at the filter?
 
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