Re: [GMCnet] Need help identifying this part? [message #326779 is a reply to message #326777] |
Tue, 05 December 2017 21:40 |
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It's not a line lock is it?
On Dec 5, 2017 9:29 PM, "Matt Colie" wrote:
GMC Jimmy wrote on Tue, 05 December 2017 22:01
> Hello All, getting ready to install my Fitech and need to plumb a return
line into the fuel filler neck and noticed this part... can you tell me
> what it is?
>
> http://www.gmcmhphotos.com/photos/my-75-royale/p64083-image348.html
>
> Also, I will need to wire the fuel injection system, where did - would
you tap into for an ignition source?
>
> Thanks for your help,
> Regards,
> Mike
Mike,
I actually recognize the part, but what it is doing there, I have no idea.
I believe it is a proportioning regulator (c.1980). It was used before the
burden (weight on the suspension) version became available in pickups and
other light trucks. The top switch was actually a pressure sensing brake
light switch and the lower one is part of a fault sensing circuit that I am
having a hard time recalling the function of.
Is it in the rear brake line?? Maybe I should have asked that first.
I hate to admit that the LED recently installed over my head just came
on......
There is a decent bet that it was put in to try to stop the rear brake lock
up.
If it did work, in the case of a GMC all it would do is reduce total brake
effectiveness.
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