1994 Buick Century, 3.1 V6 Problems! - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-26-2014, 04:07 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, 05:09 PM   #32
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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, 05:13 PM   #33
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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, 05:14 PM   #34
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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, 05:17 PM   #35
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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, 05:24 PM   #36
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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 02-27-2014, 12:43 AM   #37
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New fuel pump / sender hanger assembly will be here Friday.
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