Club Cobra - Fuel guage accuracy issues

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- - Fuel guage accuracy issues (http://www.clubcobra.com/forums/backdraft-racing/64305-fuel-guage-accuracy-issues.html)

BDRCobra is your speedometer cable or electrical driven?

Sound like you need to change the gear if it's cable. Easy thing to do.

Ford Speedometer Gear Calculator

Quote:

Originally Posted by HI Cobra (Post 585076)

I don't have a BDR but my gauge only goes to about 1/2 when it is full.
It doesn't bounce or anything but for now I use the trip odometer and
zero it everytime I fill it and just go by the mileage to stay out of trouble.
When it gets down to empty I still have about 8 gallons but don't wait
long to fill it. So far, so good.

Easy Peasy….who cares about a fuel gage when a odometer will do the most important job of preventing you from running out of gas... :)

Lom,

This thread died in 2005 so its a good idea to say "I'm rezzing an old thread" in your post so folks won't try an assist folks on 13 year old posts as in above.

The unit they sent you helps calibrate the Gauge to Sender over the entire range much the the Classic Instruments SN34 unit. https://www.jegs.com/i/Classic-Instr.../SN34/10002/-1

Neither will provide dampening of readings due to fuel slosh. My tank has lateral baffle plates which still do no good for gauge needle swings.

The tube sender you have (probably the same PN as mine) has a lot more dampening than a swing arm lever sender or capacitance sender due to the float being internal to the tube and 0.060" drain holes at the top and bottom of the tube effectively slowing changes.

Mine was sticking in various positions so I installed a Programmable Speedhut fuel gauge but still had the sticking issue.
I changed the sender (PN VDO 224-221 SENDER FUEL DIP PIPE 54MM L 210MM) and now all is good.
I'd check with the Backdraft folks on the PN though since mine is a very early car.

I have #595, The gauge was reading 1/4 to 1/2 wrong all the time. Checked the gauge as indicated in one of the threads, was fine. Bad sender. Installed a new one, the one listed in one of the threads, some movement with the needle on acceleration, but then stabilizes out and reads correctly.

The Fuel Gauge Wizard (https://www.spiyda.com/fuel-gauge-wizard-mk3.html) as sent to me by Backdraft, have an Anti-slosh setting of values between 1 - 10. I set mine to 5 and now it reads perfectly. No more needle bounce and it was very easy to do following the instructions.

You guys must be much better drivers than I am.

The last thing I have time to do is check out my fuel gauge movement when I’m accelerating. I’m too concerned about keeping my car pointed straight and between the white lines.