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03-15-2007, 04:56 PM
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#1 |
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Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Fuel Pump Knock
My 68 has had a fuel pump noise ever since I swapped my 307 for an '86
305. I used the fuel pump and shaft from the 307 and it made knocking noises under load at slow speed. I got a new pump, but the noise remains. Any ideas??
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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03-15-2007, 07:41 PM
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#2 |
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Active Member
 Join Date: Jun 2002
Location: L.A. Lower Alabama
Posts: 453
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Re: Fuel Pump Knock
Fuel pump cam lobe worn?
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1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin |
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03-15-2007, 07:54 PM
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#3 |
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Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: Fuel Pump Knock
I don't think so. I haven't actually inspected the cam, but neither end of the pump shaft has irregular wear. Could that lobe be worn without the shaft showing any signs?
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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03-15-2007, 10:00 PM
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#4 |
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GEARHEAD
Join Date: Jan 2007
Location: CENTRAL,PA
Posts: 2,284
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Re: Fuel Pump Knock
Iwould think there would be some sign of wear. Are you 100% sure the pump is the source of the noise. A little trick is a long card board tube like from gift wrap kinda make an impromto mechanic stethescope. RJ22
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03-16-2007, 05:20 AM
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#5 |
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Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: Fuel Pump Knock
I use a piece of long heater hose as a "stethoscope". You can heaer the noise coming directly from the pump housing. I chased this noise everywhere before I could finally isolate it.
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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03-16-2007, 07:38 AM
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#6 |
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Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Fuel Pump Knock
I suggest you changeout the fuel pump. Those things are known to make a knocking noise when the rocker gets worn in the pivot point. It will sound like a rod knock, soon.
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03-16-2007, 11:59 AM
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#7 |
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Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: Fuel Pump Knock
I replaced it about 2 weeks ago, but no change. I thought trying an '86 pump, but it has the provision for the return. Can I still use it if I cap the return?
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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03-16-2007, 12:30 PM
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#8 |
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Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Fuel Pump Knock
YES, you can cap the return.
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03-16-2007, 12:36 PM
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#9 |
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Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: Fuel Pump Knock
I may try that and see if my noise goes away. Thanks for help.
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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07-30-2007, 11:08 AM
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#10 |
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Registered User
Join Date: Jul 2005
Location: Katy, TX
Posts: 48
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Re: Fuel Pump Knock
Dave:
Did you ever solve your fuel pump knock? My broomstick tells me that is where my knock is located. I found my all my other knocks- I learned that big cams and stock valve covers do not play well together.
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1970 CST-10 owned it 26 years, finally back on the road after a 10 year rest. 1989 Suburban 1971 Sleekcraft 455Olds Berkeley 1992 SC400 pimp ricer |
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