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I pulled out a GM Tyco 9831 fuel pump relay to run the fuel pressure down before disconnecting the fuel rail connector, now?
The relay can be flopped in reversed and there is no marking on the panel for polarity. There are several of these relays and I do have a link to the relay box (FUEL-PMP) next to 31-33 fuses.
There is a beveled edge on these relays, I neglected to look when pulling it out assuming it was socket sexed or marked and now need the proper orientation on the relay that can be installed in both 180 degree orientations. The Fog lamp (notch to left) and A/C compressor (notch to top) in the picture diagram are the same Tyco 9831 relay.
I took my VOM to the socket teminals with a paperclip and identified the ground lug, it goes notch up like the A/C compressor relay.
I'll tell you what happened, the oil press sender has a tiny little filter screen under the press SW. I spent 3 hours trying to remove the filter only to realize the filter wasn't in the cavity under the press SW. It's all back together running with no leaks and 50 psi oil pressure now.
5 Answers
- Pilsner ManLv 73 years agoFavorite Answer
It makes no difference to a coil what side the 28V and ground are on. The only time it would make a difference is if the relay had an anti-ringing diode across the coil, but general automotive relays don't use them. I assume that the relay is 4 pin. If it is, the relay will go in both ways. it will operate both ways.
I couldn't find info on that particular relay.
- RolomaticLv 63 years ago
I fixed it in -15F temps and had to go buy a kerosene 80K BTU bullet garage heater to get the job done so I'll give myself best answer, now I know why this repair forum has become a totally worthless source of real help. This site used to be a very helpful place when in need, now it's just full of prideful helmet headed idiots that fight about past conquests with no really helpful guidance sadly.
- Old Man DirtLv 73 years ago
One terminal will be hot all the time, this is the hot lead for the contact point side. The other lead will be hot only when the ignition is in the run (or start) position. So take either a test lamp or a vom to identify them.
- thebax2006Lv 73 years ago
Most relays go back in with a similar direction. Pull one of the other relays near is and see where the #30 terminal is located and put the fuel pump relay back in like that. Those relay while being able to be plugged in both directions do have a different offset and you should be able to see the outline of the relay in the fuse box where dirt has settled. It will be interesting to see what you mess up next while fooling around with the fuel rail for whatever reason!
Source(s): Mitsubishi Master Tech - Anonymous3 years ago
Get a wiring diagram for the fuel pump circuit. Get a multimeter and/or test light and check which are the control power, control ground, load power and output power terminals for the relay. You have to power the circuit to check (cranking the engine).
