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Wire Size For VDO Fuel Senders

 
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dvanlanen



Joined: 25 Jul 2006
Posts: 122
Location: Madison, WI

PostPosted: Mon Nov 10, 2008 8:32 pm    Post subject: Wire Size For VDO Fuel Senders Reply with quote

I tried to find information on this in the archives, but was not successful. Can anyone tell me what size wire I should be using for the VDO fuel senders? From my reading, I understand that wire should be sized based on the current load of the device and any derating factor if placed in a bundle. However, there is no amperage information provided with the fuel senders. The only information I could find, in the assembly guide, is the variable resistance (from approx. 70 ohms at empty position to approx. 10 ohms at full position). Does the wire size actually depend on what I will be using on the other end for the fuel gauges?
Thanks for any help you can provide,
Dave Van Lanen
601XL [quote][b]


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dvanlanen



Joined: 25 Jul 2006
Posts: 122
Location: Madison, WI

PostPosted: Mon Nov 10, 2008 8:32 pm    Post subject: Wire Size For VDO Fuel Senders Reply with quote

I tried to find information on this in the archives, but was not successful. Can anyone tell me what size wire I should be using for the VDO fuel senders? From my reading, I understand that wire should be sized based on the current load of the device and any derating factor if placed in a bundle. However, there is no amperage information provided with the fuel senders. The only information I could find, in the assembly guide, is the variable resistance (from approx. 70 ohms at empty position to approx. 10 ohms at full position). Does the wire size actually depend on what I will be using on the other end for the fuel gauges?
Thanks for any help you can provide,
Dave Van Lanen
601XL [quote][b]


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psm(at)att.net
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PostPosted: Mon Nov 10, 2008 8:47 pm    Post subject: Wire Size For VDO Fuel Senders Reply with quote

Hi Dave,

The current load from your fuel sender can be calculated by taking the minimum resistance in ohms and dividing the voltage (14) by it. I suspect you will get something less than 1 amp. That would suggest you could use any size wire you want.

However, you want wire that is strong enough mechanically to stand up to the rigors of flying around in your plane. This might suggest 16 awg or perhaps something down to 22 awg depending on how strong you think the wire should be and how well it is supported as it is routed from the fuel tank to the fuel gauge.

In the end, it is just a coin flipper.

Paul
XL getting close


At 08:27 PM 11/10/2008, you wrote:

[quote]I tried to find information on this in the archives, but was not successful. Can anyone tell me what size wire I should be using for the VDO fuel senders? From my reading, I understand that wire should be sized based on the current load of the device and any derating factor if placed in a bundle. However, there is no amperage information provided with the fuel senders. The only information I could find, in the assembly guide, is the variable resistance (from approx. 70 ohms at empty position to approx. 10 ohms at full position). Does the wire size actually depend on what I will be using on the other end for the fuel gauges?

Thanks for any help you can provide,

Dave Van Lanen

601XL[b]


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JohnDRead(at)aol.com
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PostPosted: Mon Nov 10, 2008 8:54 pm    Post subject: Wire Size For VDO Fuel Senders Reply with quote

Hello Dave;
� I am using 16 gauge wire every where other than in places where high current is required. While this may be overkill I like the mechanical strength of that size of wire.

John Read

Phone: 303-648-3261
Fax: 303-648-3262
Cell: 719-494-4567



AOL Search: Your one stop for directions, recipes and all other Holiday needs. Search Now.
[quote][b]


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craig(at)craigandjean.com
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PostPosted: Mon Nov 10, 2008 9:07 pm    Post subject: Wire Size For VDO Fuel Senders Reply with quote

Given the minimal current flow the limiting factor will be a wire big enough to reliably crimp a connector onto.

-- Craig

From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Dave VanLanen
Sent: Monday, November 10, 2008 9:27 PM
To: zenith601-list(at)matronics.com; zenith-list(at)matronics.com
Subject: Wire Size For VDO Fuel Senders



I tried to find information on this in the archives, but was not successful. Can anyone tell me what size wire I should be using for the VDO fuel senders? >From my reading, I understand that wire should be sized based on the current load of the device and any derating factor if placed in a bundle. However, there is no amperage information provided with the fuel senders. The only information I could find, in the assembly guide, is the variable resistance (from approx. 70 ohms at empty position to approx. 10 ohms at full position). Does the wire size actually depend on what I will be using on the other end for the fuel gauges?
Thanks for any help you can provide,
Dave Van Lanen
601XL
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bryanmmartin



Joined: 10 Jan 2006
Posts: 1018

PostPosted: Tue Nov 11, 2008 8:10 am    Post subject: Wire Size For VDO Fuel Senders Reply with quote

You're neglecting the resistance of the fuel gauge itself, which may
be several thousand ohms. The current in a meter circuit is
negligible, a few milliamps at most. The physical strength of the wire
and possibly, the resistance of the wire dictate wire size.

On Nov 10, 2008, at 11:47 PM, Paul Mulwitz wrote:

Quote:
Hi Dave,

The current load from your fuel sender can be calculated by taking
the minimum resistance in ohms and dividing the voltage (14) by it.
I suspect you will get something less than 1 amp. That would
suggest you could use any size wire you want.

However, you want wire that is strong enough mechanically to stand
up to the rigors of flying around in your plane. This might suggest
16 awg or perhaps something down to 22 awg depending on how strong
you think the wire should be and how well it is supported as it is
routed from the fuel tank to the fuel gauge.

In the end, it is just a coin flipper.

--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.
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