I have a GM TBI sending unit I plan to use in my '81 Elky EFI conversion. It has 4 tubes in it. I understand that the 3/8" one that hooks to the pump is the output. There is a 5/16 line that goes all the way down by the bottom of the tank, then there is a 5/16 that terminates near the top of the tank that seems to have some kind of check valve on it, and then there is another 3/8 tube that just stops near the top of the tank.
Anyone know which tube does what? I am guessing the 5/16 that goes to the bottom of the tank is the return line, the 5/16 with the check valve is for the carbon cannister, and maybe the 3/8 that stops at the top of the tank is for a vent to the filler neck. Does that sound right?
Thanks,
Clay
GM 4 tube sending unit, what tubes do what?
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
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Re: GM 4 tube sending unit, what tubes do what?
Yes, You are correct.