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Bouncy Fuel Gauge on 54 3100
#965927 Thu Aug 22 2013 08:33 AM
Joined: Jan 2011
Posts: 160
H
harryr Offline OP
Wrench Fetcher
Not sure where to post this.

The PO had installed a new fuel tank and gauge. The gauge reads fine, but constantly bounces around as the fuel sloshes in the tank. A little of this would be OK, but I think it is excessive. I would like to damp it down somehow. Anyone run into this before? Thanks.

Harry

Re: Bouncy Fuel Gauge on 54 3100
harryr #965937 Thu Aug 22 2013 09:06 AM
Joined: Nov 2006
Posts: 2,658
D
Shop Shark
Was it replaced with a factory original tank and sending unit?

Re: Bouncy Fuel Gauge on 54 3100
harryr #965949 Thu Aug 22 2013 09:37 AM
Joined: Jan 2009
Posts: 1,693
P
Shop Shark
I've had the same problem,in my 52 it's the sending unit it has a dead spot.


Pete

Re: Bouncy Fuel Gauge on 54 3100
harryr #965975 Thu Aug 22 2013 11:36 AM
Joined: Jan 2011
Posts: 160
H
harryr Offline OP
Wrench Fetcher
Don, I doubt anything was "factory original." It is a repro, and so is the sending unit, I'm sure. Pete, not sure I follow. To me it looks like over "oversensitivity" problem, rather than a dead spot. Does not do it at all, obviously when it is full. Range of bounce gets greater the emptier the tank is.

A friend suggested that there might be some kind of damper, or maybe some way to restrain the movement of the float lever. Along those lines, on page 23 of the Classic Part catalog, I now see an item called a "gas tank sender unit sock filter." I never heard of this, but maybe that I s exactly what it is used for. Before I order one, has anyone used such a thing?

Harry

Re: Bouncy Fuel Gauge on 54 3100
harryr #965990 Thu Aug 22 2013 01:10 PM
Joined: Nov 2006
Posts: 2,658
D
Shop Shark
I've seen some of the reproduction sending unit that have a plastic float on them. The original either had a cork or brass and the plastic is lighter. I believe that the fluctuation of the gauge is caused by the float being to light and it moves around, thus the gauge is not steady.

Re: Bouncy Fuel Gauge on 54 3100
don stocker #965995 Thu Aug 22 2013 01:38 PM
Joined: Jan 2013
Posts: 1,426
J
Shop Shark
I've seen the problem in Hot Rod tanks. Stock tanks usually have some baffles to reduce slosh on cornering, braking, etc.

Some aftermarket tanks are just tanks with, at best, a little baffling around the fuel pickup..

Re: Bouncy Fuel Gauge on 54 3100
harryr #966047 Thu Aug 22 2013 05:52 PM
Joined: Jan 2011
Posts: 160
H
harryr Offline OP
Wrench Fetcher
Ok, thanks for the comments. I have decided to pull the float switch and see if I can make the float itself a bit heavier, so it will still float, but not be as "active."

Stay tuned.

Re: Bouncy Fuel Gauge on 54 3100
harryr #966070 Thu Aug 22 2013 06:44 PM
Joined: Aug 2005
Posts: 9,013
Master Gabster
Jim hit the nail on the head. The stock tank has baffles. If your hot rod tank does not I don't see a way to stop it. The tank in my '38 is baffled on three sides with the side of the tank making the fourth. There's 1/2" open at the top with only small drainage channels on the bottom.


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Re: Bouncy Fuel Gauge on 54 3100
harryr #966124 Thu Aug 22 2013 09:11 PM
Joined: Nov 2012
Posts: 17
4
New Guy
any electrical engineers out there? it seems to me a capacitor would dampen the gauge.

Re: Bouncy Fuel Gauge on 54 3100
harryr #966153 Thu Aug 22 2013 09:48 PM
Joined: May 2001
Posts: 8,386
Extreme Gabster
The sock is for the pick up tube.

Sounds to me like the 'problem' is caused by fuel shifting in the tank. Is this really a problem?


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