caber
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| posted on 11/1/07 at 08:56 PM |
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Fuel Tank Earth
I don't have a stud on my fuel tank to use to connect an earth. I presume one is needed to the body of the tank as it is sitting in rubbers and
the earth on the fuel sender is isolated from the tank body by a rubber gasket?
Do I actually need the rubbers on the tank if it is strapped down tight? I don't see this detail on production cars?
Caber
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DIY Si
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| posted on 11/1/07 at 09:00 PM |
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Most cars I've looked have rubber straps between the tank and its straps. These are older cars admittedly. Can't say as I've ever
seen an earth strap though.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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mookaloid
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| posted on 11/1/07 at 09:06 PM |
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you only need to provide an earth to the sender body - I used one of the sender mounting screws to mount a permanent earth wire
HTH
Mark
"That thing you're thinking - it wont be that."
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caber
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| posted on 11/1/07 at 09:29 PM |
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Hmmm, no earth, sender fails with live to tank, garage filler nozzle goes in touching petrol filler tube bolted to ally body and touches tube on tank
linked by v short rubber tube, spark BANG!
Not to keen on that scenario and it is a little more likely than the urban myth spark from mobile phone in car!
Caber
PS how come no one ever worried about CB's at filling station? i would have thought the power on some of those more likely to cause spark to
earth?
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James
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| posted on 11/1/07 at 09:34 PM |
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Caber,
What about jubilee clipping an earth strap to the filler neck?
I got this idea looking at the earth on the sink at work whilst sitting on the crapper! 
As for the phone thing.... there was a post about this recently... I believe it's more to do with dropping the phone and it sparking rather than
a spark when you're using it.
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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jollygreengiant
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| posted on 11/1/07 at 10:07 PM |
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quote:
Originally posted by James
As for the phone thing.... there was a post about this recently... I believe it's more to do with dropping the phone and it sparking rather than
a spark when you're using it.
Cheers,
James
Yep its all about energy.
If you drop the phone and its battery shorts out then that battery has enough energy to ignite fuel.
Same thing with smoking, the cigarette does NOT produce enough energy to ingnite fuel OR vapour, in fact you would extinguish the cigarette in fuel.
The no smoking is to stop people lighting up, a match/lighter/electrical lighter has more than enough energy to ignite fuel.
Oh and while we are on the subject of ignition.
What combination of fluid and hot surface on a vehicle is GUARANTEED to produce combustion.?
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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David Jenkins
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| posted on 11/1/07 at 10:27 PM |
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Brake fluid?
BTW: my fuel sender has a Lucas blade earth tag on the metalwork...
David
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locoboy
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| posted on 11/1/07 at 10:29 PM |
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quote:
Originally posted by jollygreengiant
Oh and while we are on the subject of ignition.
What combination of fluid and hot surface on a vehicle is GUARANTEED to produce combustion.?
Brake fluid?
ATB
Locoboy
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locoboy
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| posted on 11/1/07 at 10:29 PM |
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quote:
Originally posted by David Jenkins
BTW: my fuel sender has a Lucas blade earth tag on the metalwork...
David
But what about the TANK?
ATB
Locoboy
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iank
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| posted on 11/1/07 at 11:19 PM |
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Is your sender not mounted onto the tank with screws/bolts? If so the sender earth will earth the tank as well.
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Peteff
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| posted on 12/1/07 at 12:21 AM |
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I got this idea looking at the earth on the sink at work whilst sitting on the crapper!
Close the f**king door man, or are you an exhibitionist? Does petrol act as an earth like water otherwise an earth on the water pipes would be
wasted with a plastic feed into the house?
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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David Jenkins
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| posted on 12/1/07 at 09:16 AM |
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Note to self: must avoid cryptic answers!
"Brake fluid" was my answer to the "jollygreengiant" question re inflammable fluid.
My fuel sender has an earth tag. As has been suggested, the sender is screwed to the tank with steel screws, so the tank gets earthed as well.
Does that make it all clear? 
David
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02GF74
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| posted on 12/1/07 at 09:53 AM |
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quote:
Originally posted by caber
Hmmm, no earth, sender fails with live to tank, garage filler nozzle goes in touching petrol filler tube bolted to ally body and touches tube on tank
linked by v short rubber tube, spark BANG!
hmmm, firstly I believe the usaul wiring is:
12 V - guage - sender - 0v.
The guage has internal resistance that will limit the current as does the sender.
If you tank is isolated, then even if it is 12 V and let's say worst case it directly connected to 12 V, if the filler neck is rubber and
I'd be very sur;rised if you arrangement was metal from the filler to tank, then the tank is still isolated from the pump.
It is good practise to leave the ignition off so none of the electric, including fuel guage is live.
In other words, I donl.t think you have a problem, and if it does blow up, you'll probably not be around to argue
(I site on 10 gallons of petrol with another 10 under the passener every time I drive the Land Rover and I;m still here, ok, I've lost a leg,
burnt off both ears and partially sighted in 1 eye and had 70 % burns due a tank exploding but am still here )
But going back to the question, my gut feel is that if it were me, I'd want my tank to be earthed - it is in most cars - the sender has to screw
in to the metal of the tank so either put a couple of metal tabs on there or solder one onto the sender <- but the soldering is done with the
sender removed from the tank
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jollygreengiant
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| posted on 12/1/07 at 09:38 PM |
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quote:
Originally posted by David Jenkins
Note to self: must avoid cryptic answers!
"Brake fluid" was my answer to the "jollygreengiant" question re inflammable fluid.
My fuel sender has an earth tag. As has been suggested, the sender is screwed to the tank with steel screws, so the tank gets earthed as well.
Does that make it all clear?
David
Yep clear as mud being sucked out of a black hole.
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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David Jenkins
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| posted on 12/1/07 at 10:10 PM |
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Well, that's even more obscure than my post!
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westcost1
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| posted on 19/1/07 at 12:06 PM |
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As for the rubber insulation strips I was looking at lorry tanks when in traffic the other day and they all have rubber inserts between the tank and
straps
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