| Re: Need help identifying this part? [message #326777 is a reply to message #326774] |
Tue, 05 December 2017 21:28   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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GMC Jimmy wrote on Tue, 05 December 2017 22:01Hello 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.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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