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1994 Buick Century, 3.1 V6 Problems!

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Old 02-26-2014, 03:07 PM
  #31  
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See, this whole time it could be electrical. I don't hear the fuel pump engaging AT ALL. I know what it sounds like but I just don't hear it, even if I have my head underneath the vehicle and turn the key.

My next test is to check line pressure before the fuel filter using a special T fitting with the kit and check for electrical. I've already switched relays with the blower fan, so it'* not a relay.. could be a fuse inside.

Be back.
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Old 02-26-2014, 04:09 PM
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lack of pressure could be poor connections, power and ground but it has to be on if it runs and puts out 23
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Old 02-26-2014, 04:13 PM
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Isn't 23 PSI a tad low? Even our 3.8'* need around 40.
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Old 02-26-2014, 04:14 PM
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Swapped relays in engine bay, no change in pressure. Checked wire harness near gas tank looks fine.

I'm guessing weak fuel pump or clogged lines before filter.
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Old 02-26-2014, 04:17 PM
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im leaning toward the pump now but the regulator not doing anything bothers me a little
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Old 02-26-2014, 04:24 PM
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The FPR is probably still stuck in at the idle position, allowing most of the fuel to return to the tank. When load/RPM increases, the FPR is suppose to restrict the fuel going back to the tank.
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Old 02-26-2014, 11:43 PM
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New fuel pump / sender hanger assembly will be here Friday.
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Old 05-25-2022, 12:14 PM
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I guess I'm late to the thread, but I wonder if it was the check valve in the fuel pump. I had the same issues with my '94 Buick and ended up putting in an inline check valve and solved the fuel pressure issue.
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Old 05-25-2022, 02:51 PM
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Originally Posted by danjamesjr
Thanks! Yes I have, a little too many lol.

I can't get it scanned, no shops around have obd1 scanners :(

No CEL

Did not replace spark plug wires.

Thanks
Here'* a scanner that will show live data and all the different modules.
https://www.ebay.com/itm/27530246918...3ABFBMgsfzyJ9g
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Old 05-25-2022, 02:54 PM
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That bogging could be MAF. Unplug it and drive it. What does it do?
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