Tapping Noise Gas Tank Area
Thread Starter
Intermediate
Joined: Nov 2007
Posts: 33
Likes: 0
From: Lanoka Harbor NJ
Tapping Noise Gas Tank Area
Have a 1978 with a tapping noise while car is running and get worse when rev engine tapping goes faster. Noise driving me nuts any help would be great thanks charlie.
Last edited by 25anniv; Mar 2, 2008 at 10:34 AM. Reason: fixed problem
Thread Starter
Intermediate
Joined: Nov 2007
Posts: 33
Likes: 0
From: Lanoka Harbor NJ
does it while sitting in driveway running in park. does increce with rpm almost sounds like a loose line on top ot tank?? thanks
Intermediate
Joined: Feb 2006
Posts: 30
Likes: 0
From: ellisville mo
I have a 79 that does the same thing. It has been going on now for a number of years. It is not too loud, just enough to be bothersome. It doesn't happen all the time but sporadically. I have tried to locate the source and have had a mechanic try to find it. We have both failed. I have had all the exhaust system checked, the rear end was rebuilt last year,the fuel tank was dropped to search around the tank area, and the spare tire and compartment seem to be secure. Any ideas would be appreciated.
Safety Car
Joined: Apr 2007
Posts: 4,435
Likes: 9
From: Kalamazoo Mi
turn your radio up
but seriously i have had strange noises on varrious cars over the years. It can drive you nuts trying to locate a strange squeek, or rattle. Usually its somthing like a creeky suspension, or some bushing in need of oil, or an exhaust hanger. Point is usually its nothing to worry about, just annoying and frustrateing .
but seriously i have had strange noises on varrious cars over the years. It can drive you nuts trying to locate a strange squeek, or rattle. Usually its somthing like a creeky suspension, or some bushing in need of oil, or an exhaust hanger. Point is usually its nothing to worry about, just annoying and frustrateing .
Intermediate
Joined: Oct 2007
Posts: 28
Likes: 0
From: Toney AL
There are 2 metal lines that run up from the passenger side of the car over the top of the tank to the mouth of the gas tank. They fit into rubber hoses as they connect to the tank. They may have some play in them and be rattling on the tank. I had to replace the rubber hoses on my 78 this summer and have noticed the same sound you describe. My first thought was those two metal fuel lines.
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Heel & Toe
Joined: Oct 2007
Posts: 19
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From: Dunnellon FL
metal expands and contracts
weld the seams on your exhaust,clamps hold parts together but dont always seal when system gets hot,as pipes expand leaks can develop and mysteriously disappear as system cools.I have been a truck mechanic and fabricator for 35 years and have seen this problem over and over again.
Intermediate
Joined: Nov 2005
Posts: 40
Likes: 0
From: Kent WA
Does the tapping increase with engine RPM or with road speed?
If engine RPM, it could be "fuel line hammer" (pulses from the fuel
pump could be causing the fuel line to oscillate/move and if the line
is close to something, like the fuel tank, it'll make a tapping noise).
My '68 does it now and then (usually during cold ambient temps)
but the '81 doesn't....
Bela P. Havasreti
If engine RPM, it could be "fuel line hammer" (pulses from the fuel
pump could be causing the fuel line to oscillate/move and if the line
is close to something, like the fuel tank, it'll make a tapping noise).
My '68 does it now and then (usually during cold ambient temps)
but the '81 doesn't....
Bela P. Havasreti
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
DO NOT rotate driveline with rear wheels hanging....Support the rear wheels under shock support or somewhere on trailing arm!!!!
Melting Slicks
Joined: Dec 2006
Posts: 2,669
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From: Kingston Ontario
