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V8Simon

Member Since: 17 May 2016
Location: Prestatyn, Wales
Posts: 146

1985 Defender 90 V8 Petrol SW Auto Arles Blue

Joining 1984 fuel tank to Puma gauge

Hi all, hoping for some practical advice on sorting out my fuel gauge that isn't quite reading right however.....

I've fitted a puma bulkhead and instruments to my 1984 90 and therefore have an underseat tank and original (1980's) sender. The gauge reads almost right at the top of the scale but shows just under 1/4 at the bottom when the tank is empy.
I've had the sender out and when I move the float get the same range as when its in the tank and burning through the fuel.

Having an accurate gauge is important to me as its a V8 and every extra millimeter showing on the gauge means an extra 400 yrds

Ideally, I would like to just fit a puma sender in to my tank however I'm presuming there's a whole host of problems with mounting holes, tank depth etc to work thorugh. Or, can I do something with the original sender to change the resistance so the gauge shows right????
Any advice gratefully recieved

8th Oct 2018 1:10pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

Could you not fit a puma rear fuel tank and sender? You would have to adjust the mounts, but it should fit fine between the chassis rails.

8th Oct 2018 1:17pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

What year Puma instruments?

1988 90 Td5 NAS soft top

2015 D90 XS SW

8th Oct 2018 1:21pm

V8Simon

Member Since: 17 May 2016
Location: Prestatyn, Wales
Posts: 146

2007 I think they are.

8th Oct 2018 1:23pm

V8Simon

Member Since: 17 May 2016
Location: Prestatyn, Wales
Posts: 146

geobloke wrote:
Could you not fit a puma rear fuel tank and sender? You would have to adjust the mounts, but it should fit fine between the chassis rails.

That's one option I'd not thought about but sounds fairly involved. I'm hoping there's a 'electronic' fix I can do

8th Oct 2018 1:25pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

Ok well how about this then;

https://sites.google.com/site/shannonpower...fuel-gauge

8th Oct 2018 1:33pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

Can you measure the "full" and "empty" resistance of your sender?

1988 90 Td5 NAS soft top

2015 D90 XS SW

8th Oct 2018 1:35pm

V8Simon

Member Since: 17 May 2016
Location: Prestatyn, Wales
Posts: 146

geobloke wrote:
Ok well how about this then;

https://sites.google.com/site/shannonpower...fuel-gauge

Humm that appears to be my problem in the second explanation. I'll have to give it a try and see what happens!

Thanks for sharing

8th Oct 2018 3:17pm

V8Simon

Member Since: 17 May 2016
Location: Prestatyn, Wales
Posts: 146

Martin wrote:
Can you measure the "full" and "empty" resistance of your sender?

I guess so using my multimeter. I'm thinking if I got the same info from a puma sender, I could follow the guide from Geobloke but with a bit more know how?

8th Oct 2018 3:20pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

2.4 Puma is the same as a Tdi and Td5. Haven't measured a V8 or petrol sender so can't advise without measurements

1988 90 Td5 NAS soft top

2015 D90 XS SW

8th Oct 2018 3:26pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

Quote:
2.4 Puma is the same as a Tdi and Td5. Haven't measured a V8 or petrol sender so can't advise without measurements Smile

Learn something everyday

8th Oct 2018 3:35pm

V8Simon

Member Since: 17 May 2016
Location: Prestatyn, Wales
Posts: 146

Martin wrote:
2.4 Puma is the same as a Tdi and Td5. Haven't measured a V8 or petrol sender so can't advise without measurements

So if I can fit a TDi sender in my tank which might be a little easier rather than try the TDCi one, it will be accurate on the gauge??

EBAY here I come..........

9th Oct 2018 10:40am

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

In theory yes - my side tank sender (1988 TD) works the Puma gauges nicely, same as the rear tank sender (Td5).

However, get a multimeter on your existing one to see what's going on with the Ohms first.

1988 90 Td5 NAS soft top

2015 D90 XS SW

9th Oct 2018 10:42am

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