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Spunes Samba Member
Joined: May 15, 2023 Posts: 29 Location: Colorado
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Posted: Thu Aug 17, 2023 3:14 pm Post subject: fuel pump is whining |
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my fuel pump started whining, so I replaced the filter and the pump. the ground wire is super old and rusted, other than that, what can I do to get rid of the noise? |
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32634 Location: Reading Pennsylvania
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space Samba Member
Joined: November 19, 2017 Posts: 673
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Posted: Thu Aug 17, 2023 3:54 pm Post subject: Re: fuel pump is whining |
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Spunes wrote: |
my fuel pump started whining, so I replaced the filter and the pump. the ground wire is super old and rusted, other than that, what can I do to get rid of the noise? |
Isolate the pump from any metal parts
There should be an isolation sleeve w ur pump _________________ 82 westy
w:
2.5 JDM Subie
Rear discs |
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atomatom Samba Member
Joined: May 15, 2012 Posts: 1867 Location: in an 84 Westy or Bowen Island, BC
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Posted: Thu Aug 17, 2023 8:06 pm Post subject: Re: fuel pump is whining |
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i replaced my fuel tank, and my pump still whines. i'm whining too. it is contagious.
new pumps seem to be iffy. my old pump didn't whine at all, until it died, on all hallows eve. maybe the new pumps are haunted by the ghost of the old pump.
as dave says, search and find lots of solutions, including a lot of crazy crap like putting a very hot ceramic resistor next to your fuel lines.
after reading all the solutions, i'm resigned to be ok with a little whine. _________________ 84 Vanagon Westy, 1.9L, California raised but defected to Canada. |
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E1 Samba Member
Joined: January 21, 2013 Posts: 6585 Location: Westfalia, Earth
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Posted: Thu Aug 17, 2023 8:48 pm Post subject: Re: fuel pump is whining |
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I only used to get that buzz if extremely hot out, with the pump pretty hot, too, and presumed it was classic cavitation. Cool down, fire up, it’d disappear.
But in these last few years, I seem to get it a lot more with the newer Boschs, even when still shiny.
It might be the new normal. We just carry two spares.
All we run now is the “post-pump” canister filter. Using only the plastic “pre-pump filter” before, it seemed to greatly stress the pump in general. One thing with the canister, about twice a year if noticing any lack of performance or inconsistent power, it definitely helps to pull off the pump inlet hose, block the flow with whatever you can, and (carefully) Q-tip the inlet on the pump. It does get soiled without the pre-filter, which slows fuel flow into the pump, and seemingly contributes to the classic whine. _________________ ‘84 Westy, 2.1L with Digijet, 5.43 R+P, GT Gears
"Adding power makes you faster on the straights.
Subtracting weight makes you faster everywhere."
— Colin Chapman |
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jocoman Samba Member
Joined: August 11, 2016 Posts: 427 Location: Ottawa, Canada
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Posted: Fri Aug 18, 2023 6:12 am Post subject: Re: fuel pump is whining |
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I just carry a good spare and ignore it. Been like that for many many miles. _________________ '86 Westfalia 2.0L Zetec
'97 Volvo 850 AWD Turbo
" The fun never stops" |
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steve244 Samba Member
Joined: March 18, 2022 Posts: 1668 Location: GA
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Posted: Fri Aug 18, 2023 6:56 am Post subject: Re: fuel pump is whining |
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I noticed something after draining my tank to check for bad gas.
I drained it by disconnecting the fuel filter and attaching a length of hose that emptied into a container. This way when the fuel pump ran (jumpered to the battery with a length of wire) there was no back pressure. The pump was also dangling at an angle. I emptied 6 gallons this way. (fuel was fine to the last drop but that's another thread).
After attaching a new filter and running the pump for several minutes with the full fuel loop intact, it quieted down. Without the engine running it's barely noticeable. This is on a cheap Chinese pump that whined like my ex-wife (who wasn't cheap).
Is it possible running the pump freely without back pressure caused it to fully purge any air? Could minute air pockets be the cause of whining? _________________ 82 AC vanagon approx 200K miles (3K are mine).
DD is a 2015 Leaf
Road Trip to Hell (FL 2023)
The Vanagon's drivetrain and chassis restomod thread. Best sung to the tune of I Did It My Way... |
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Xevin Samba Member
Joined: January 08, 2014 Posts: 7635
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Posted: Fri Aug 18, 2023 11:03 am Post subject: Re: fuel pump is whining |
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What year Van? Water Cooled, air cooled, Subaru, Bostig, or other? Details please. _________________ Keep on Busin'
67rustavenger wrote: |
GFY's Xevin and VW_Jimbo! |
Clatter wrote: |
Damn that Xevin... |
skills@eurocarsplus wrote: |
I respect Xevin and he's a turd |
SGKent wrote: |
My God! Xevin and I 100% agree |
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