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« 1 2 (3) 4 5 »

Re: Fuel Tank Surprise
#21
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Eric Boyle
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Stupid question, what would happen if you wired the fuel gauge up backwards?

Posted on: 2008/4/11 23:38
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Re: Fuel Tank Surprise
#22
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HH56
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I haven't tried it but don't think it would matter. There are only two terminals, neither marked, and a coil of heater wire wrapped around the bimetallic element between them.

Attach file:



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Posted on: 2008/4/12 10:30
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Re: Fuel Tank Surprise
#23
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PackardV8
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How much did they notch the frame??? Pic if convenient.

Posted on: 2008/4/12 22:12
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Re: Fuel Tank Surprise
#24
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Keegan Chaput
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It is a hose connection from the filler neck to the tank. I'll have to get a new hose because I destroyed the old one trying to get the tank out.

HH56- nice call on the resistor. $2 is well spent to save the factory gauge. I'll pick one up and snap some pictures of the gauge at full and empty.

I'll get a picture of the frame notch when I jack the car back up to reinstall the tank. It should be sometime this week after I get the electrics sorted out.

Question- I'm making a new gasket for the sending unit because the only other way to get one is to buy a new sending unit. What material should I use in a gasoline environment? I've got both cork and that composite gasket sheet material.

Posted on: 2008/4/13 0:12
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Re: Fuel Tank Surprise
#25
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PackardV8
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What was the original gasket made from????? I'm guessing cork. I'd most likely use the cork unless i could verify that the composite-cork is a neoprene composite and not rubber.

HOWEVER, if the existing gasket is not torn then i'd just reuse it as long as the unit is a still agood tite fit when installed.

Take a lighter and burn the composite material. Neoprene will not burn but can melt and get runny if u get it hot enuf. Rubber will just burn and gasoline will dissolve rubber but not neoprene.

Posted on: 2008/4/13 7:31
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Re: Fuel Tank Surprise
#26
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PackardV8
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As a side note:
Be carful when makeing an changes to instrumwent cluster. I have found that they are very fragile and terminal posts can twist very easily thus ruining the gaiges.

Posted on: 2008/4/13 7:37
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Re: Fuel Tank Surprise
#27
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Owen_Dyneto
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Though fuel pump diaphrams live and work in a tougher environment than your sending unit gasket, chemical resistance tables tell us that you should move away from the neo- and isoprene-type rubbers and towards Buna or perhaps nitrile rubbers. The old classic gasket material for gasoline service was of course cork coated with shellac, but ethanol is a solvent for shellac so that's no longer a good choice. However one of the Aviation gasket pastes is rated for alcohol service so as a chemist my choices for alcohol-doped gasoline would be buna rubber first, and cork with a suitable gasket cement second.

Posted on: 2008/4/13 8:37
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Re: Fuel Tank Surprise
#28
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HH56
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Packard V8 brings up a good point. I'd avoid doing too much pulling and disconnecting around instruments and ign switch unless absolutely necessary. Things are a bit fragile there. Install the resistor right at tank and then it will be easy to remove if you do come up with a better setup. Still kinda curious about the Chevy sender because 31 ohm spread sounds low and that sender may not be any good.

Posted on: 2008/4/13 9:35
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Re: Fuel Tank Surprise
#29
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PackardV8
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If the gauage is reading backwards then what about bending the float ARM in the opposite direction???? OR does the resistance reading still cause a problem???

Posted on: 2008/4/13 23:16
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Re: Fuel Tank Surprise
#30
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Keegan Chaput
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Quote:
What was the original gasket made from????? I'm guessing cork.

The gasket I pulled off of it was rubber, but it was badly damaged and the holes didn't line up properly with the mounting points.

Quote:
Be carful when makeing an changes to instrumwent cluster.

I don't plan on getting into the gauge cluster at all. I don't want to risk any damage.

Quote:

The old classic gasket material for gasoline service was of course cork coated with shellac, but ethanol is a solvent for shellac so that's no longer a good choice.

Good to know. I plan to run non-ethanol fuel as I can still get it locally here, but there are the times when it's unavoidable to buy the corn-gas. Especially here in MN where our "all knowing" government is increasing to a 20% minimum state wide.

Quote:
Still kinda curious about the Chevy sender because 31 ohm spread sounds low and that sender may not be any good.

I looked it up on the manufacturer's website www.spectrapremium.com and the sending unit is 0-35 ohm according to the spec sheets. I'm not sure if getting 31-32 ohms on my multimeter means that this one is going bad or if it's ok. I'm thinking that I'll stick with this one for now and try the in-line resistor as HH56 has suggested. If it isn't satisfactory with the resistor, then maybe I'll try to graft on the universal sender from JC Whitney.

Quote:
If the gauage is reading backwards then what about bending the float ARM in the opposite direction????


To get it to work I'd have to remove the sender and re-mount it upside down. If I go that far, I'll just try the previously mentioned universal sender for the correct Ohm range.

Posted on: 2008/4/14 20:59
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