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Mike,
I have the green book diagram and what you discribe is by-passing the relay (5 to 7 on fuse block) only on the relay contacts and blocking the relay operation by removing lead 31. The two fuel pumps run off of 87 but the in tank goes through fuse 5 to the pump. The contacts you discribe do the following:
87- Feeds fuel pumps through the operating relay from fuse 7
31- Shuts off the relay when turbo boost pressure is to high. This stops fuel from flowing and is either on or off. When it is removed the relay will not operate.
31b- Spark sensor lead for the relay to operate, It comes from pin1 of the coil. No spark signal, relay shuts down and no fuel.
15- This is the voltage for the fuel pump relay winding circuit only, not for the pumps. This is from Fuse 13 which is used for other things like the CIS circuit.
On my 82 non- turbo the total current flow from fuse 7 (taken across the fuse holder with fuse removed) is about 9-10 amps. The main pump uses about 7 and the tank pump about 2. If this reading is higher than say 11 amps, put amp meter across fuse 5 with fuse removed and you should see about 2-3 amps for the tank pump. If tank pump is ok then your main pump is drawing heavy.
What my be wrong is the relay can not handle the current flow and is causing erratic fuel flow when it heats up. When it is bypassed by the switch, pumps run normal. I have the diagram if you need some help. Good luck.
Mario
PS By removing lead 31 the PO was able to disable the relay without effecting other circuits.
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