Fuel gauge

Wiring, instruments, switchgear etc

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Fuel gauge

Postby Wynand on Fri Jul 01, 2011 7:23 pm

I tinkered with the gauges today and in particular with the fuel gauge to see if everything works OK with the sender unit I have.

For starters, the gauges I have are VDO's Gold Heritage series (older analogue model) and the fuel gauge have three lugs marked "S - ground - positive".
The sender is from a jet-ski fuel tank and the Ohm range within the numbers as specified by VDO and it has two lugs marked "S - ground"

I connected the positive (12V) to the gauge, the S on sender to S on gauge and connected the two grounds to the sender and gauge. The gauge performed beautiful with exact readings as per movement of the sender float BUT wrong way around - sender shows full, gauge reads empty and vice verso. :?:

I the changes the two wires on the sender to try and reverse the reading but it stayed the same. Then I tried to change the polarity, IOW negative to the gauge and positive as ground and no reading then.
What is wrong and how can I rectify the problem without having to buy a VDO sender unit? I tried to fit the float upside down but the stiff wiring of the sender is to short for that stunt and this is when I swopped the wiring at the sender that should do the same trick but as said, did not change the readings.

Can anyone help?
Wynand
Webpage: http://5psi.net
Car: McSorley 442E chassis
2.0l Ford Pinto with ZX9 bike carbs
Lightened flywheel, camjob, 4-2-1 exh
5 Speed Ford type 9 g/box
IRS - 3.7:1 diff ratio
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Re: Fuel gauge

Postby Wynand on Sun Jul 03, 2011 8:36 am

Problem solved via another seven forum....
Wynand
Webpage: http://5psi.net
Car: McSorley 442E chassis
2.0l Ford Pinto with ZX9 bike carbs
Lightened flywheel, camjob, 4-2-1 exh
5 Speed Ford type 9 g/box
IRS - 3.7:1 diff ratio
User avatar
Wynand
 
Posts: 148
Joined: Wed Aug 04, 2010 1:11 pm
Location: Welkom

Re: Fuel gauge

Postby flouwford on Mon Jul 04, 2011 4:58 pm

ok, are you going to tel us how you did it?
Toy: Ford MK2 1600 Sport
Daily drive: Ford Fiesta MK5, Rocam RSI, occasional track day

one day ill build a LOCOST, for the kid or wife to race, and neither of those 2 are planned
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Re: Fuel gauge

Postby Wynand on Mon Jul 04, 2011 7:25 pm

Simply bend the float wire, so it sticks out the other way that effectively reverses it....

Works like a charm but float wire is a bit short now - had to bend it in such a way it curve around the vertical ally bar holding the sender unit not to get stuck - but will be lengthened (to suit) when the fuel tank is made and the float level set for gauge.
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Wynand
Webpage: http://5psi.net
Car: McSorley 442E chassis
2.0l Ford Pinto with ZX9 bike carbs
Lightened flywheel, camjob, 4-2-1 exh
5 Speed Ford type 9 g/box
IRS - 3.7:1 diff ratio
User avatar
Wynand
 
Posts: 148
Joined: Wed Aug 04, 2010 1:11 pm
Location: Welkom


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