fuel pump fail, I think it's the pump... |
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fuel pump fail, I think it's the pump... |
emerygt350 |
Mar 16 2022, 02:08 PM
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#1
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Advanced Member Group: Members Posts: 2,154 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
So, was running fine, going to double check my timing, wouldn't restart (tried, but couldn't keep running). No pump sound and no pressure on the gauge (I love you, fuel pressure gauge). Whacked the pump with a screwdriver handle, nothing. Pushed it into the garage, figured I would give it one last listen in the quiet, heard a little bit of something, then a little grumble from the pump and I had pressure again. Started up just fine.
To me that says fuel pump, not relay. Any other experienced folk have some wisdom? I need to move my pump up front anyway but I was planning on keeping the original. now that I am thinking about it, it did struggle to start earlier in the day as well but cleared up. Car sat for a couple months during the winter. |
emerygt350 |
Mar 17 2022, 02:28 PM
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#2
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Advanced Member Group: Members Posts: 2,154 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Hmmm... Power to the pump and no signs of issues. Set my timing, drive around loving the new found peppiness and exhaust growl. Got it nice and hot, turned it off, pump sounded fine, started up without issue.
Would a dying pump recover like that or does that seem more like a relay behavior? In my experience pumps would just kind of poop the bed or at least make terrible noises. |
Bartlett 914 |
Mar 17 2022, 03:34 PM
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#3
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Advanced Member Group: Members Posts: 2,216 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
Hmmm... Power to the pump and no signs of issues. Set my timing, drive around loving the new found peppiness and exhaust growl. Got it nice and hot, turned it off, pump sounded fine, started up without issue. Would a dying pump recover like that or does that seem more like a relay behavior? In my experience pumps would just kind of poop the bed or at least make terrible noises. This is always the problem with intermittent issues. The FI circuit will shut off the pump if the car stops running. Jumping the fuel pump relay will eliminate the FI electronics as the cause. Then if there is no pressure, you can measure to insure that that you have voltage at the pump. Use a DMM to make sure and do not assume because the relay is bypassed that there is voltage there. It could be a bad connection with the supply and or ground connections. Once measured that you have voltage at the pump and no pressure (pump not running), You will know if the pump is bad or not. Go from there |
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