Author Topic: Fuel hangers  (Read 459 times)

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Offline daveismissing

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Re: Fuel hangers
« Reply #15 on: April 07 2018, 07:30:19 PM »
Dug out my spare instrument cluster, and experimented really do need about 5 ohms to hit E.
Wish I had that hanger here.

Found the veterans conclusive thread:

http://www.turbobuicks.com/forums/buick-v6-turbo-tech/54018-how-install-intank-fuel-pump.html
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Offline Forzfed

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Re: Fuel hangers
« Reply #16 on: April 07 2018, 07:36:59 PM »

Fuel hanger arrived today.
Put a meter on it. Looks like it goes from 20ohms when empty to 120 ohms when full.

A span of 100 ohms compared to 90 ohms.  That might not be too bad.

Offline daveismissing

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Re: Fuel hangers
« Reply #17 on: April 07 2018, 08:27:12 PM »
The top of the range would be fine, the top 1/4 of the tank would be above full. If its 20 ohms at the bottom then it never displays below 1/8- more or less
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Offline earlbrown

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Re: Fuel hangers
« Reply #18 on: April 08 2018, 04:24:30 PM »
Don't use 'full swing' when checking the range on the hangar.  Odds are it's greater than the actual height of the tank (both top and bottom).

Also, keep in mind, the float is about 1" around so it hits the roof before the fuel level gets to the top of the tank, so it's going to top out while you've still got a couple gallons left to go.   That's the reason cars always seem to stay on full for so long then drop like a rock.

Edit:  I just remembered my precision depth transfer tool(AKA Home Depot paint stick) was still on the hood of my TVR...    My original tank was 8-3/8" deep to the baffle and my brand new Spectra tank is 7-7/8" deep.

Years ago, when I measured that while replacing my fuel pump, I ended up modifying the hanger base to let the pump sit lower. As best as I remember that extra 1/2" netted me something like 1.85 more gallons I had access to.

Also, since it appears that attachments work now, do this to the hangar and the fuel gauge will be so responsive that you can actually see fuel slosh on the dash.

OK, they still don't work.  Basically solder a wire from the hanger tube ground to the float arm.  Do it in a decent sized loop so that the float can't break the wire over time from actuating.

Odds are it'll change the impendance reading of the output. If you look at the design of the gauge circuit, it's utter shit and I have no idea how it even works in the first place.   The ground for the reostat comes from the area the float arm passes though the metal holes on the thin casing that's mearly crimped lightly in four spots.

By giving the float arm and actual ground, the curcuit can actually do it's job.
« Last Edit: April 08 2018, 05:00:37 PM by earlbrown »
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Offline phil_long

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Re: Fuel hangers
« Reply #19 on: April 17 2018, 11:38:35 AM »
This thread is incredible seeing that I plan to redo the sending unit after I get this new dash installed. Great info gents as usual

Offline TexasT

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Re: Fuel hangers
« Reply #20 on: April 19 2018, 02:34:03 PM »
So, i'm kinda poking around looking for the electrical bulkhead fitting for the sending unit/pump hanger. Is racetronix the only place for this?

http://www.racetronix.biz/customkititems.asp?kc=BCWA-FL98HD&eq=

http://www.racetronix.biz/items.asp?Cc=CONN_SET_BH&Tp=&iTpStatus=1

I thought about getting just the yellow piece but for $50+shipping it is all rigged up.
« Last Edit: April 19 2018, 02:41:32 PM by TexasT »
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Offline daveismissing

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Re: Fuel hangers
« Reply #21 on: April 19 2018, 09:04:01 PM »
Something like Mcmaster 7807K54    might be one way to go
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Offline daveismissing

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Re: Fuel hangers
« Reply #22 on: April 19 2018, 09:13:15 PM »
YOU might want to ask full throttle since they are a racetronix dealer
Steve is Avila a dealer?
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Offline daveismissing

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Re: Fuel hangers
« Reply #23 on: April 19 2018, 09:35:18 PM »
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Offline Steve Wood

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Re: Fuel hangers
« Reply #24 on: April 20 2018, 03:45:44 PM »
YOU might want to ask full throttle since they are a racetronix dealer
Steve is Avila a dealer?

don't think so
Steve Wood

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