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no start (most of the time) 700 1989

My friend has a 89 740 non turbo 2.3 that he drove into a flooded street then died. After sitting to dry for a few hours started and drove it home and died 100 feet from his driveway. It will start if it sits for a few hours but will die after 20 - 30 seconds and not restart. Fuel pumps not running and the fuel pump relay, if I have the right one, is not clicking. They are labeled J and K, J clicks with the key in the run position but K does not click even while cranking. I swapped the relays with no change, J clicks, K no click. I jumpered 87b to 30 and still no start or fuel pumps. Has good spark, any ideas what this could be I drive a 240 am not used to the 740 different wiring and relays.








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no start (most of the time) 700 1989

Go to www.stepbystepvolvo.com for free guide to 740 no-starts. If 87/b is the same as 87/2, then you have a bad main fuel pump or the wiring is bad from the main fuel pump to 87/2. Make sure your connection to the underside of 87/b is tight.








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You're on the wrong relay(s) 700 1989

"They are labeled J and K, J clicks with the key in the run position but K does not click even while cranking. I swapped the relays with no change, J clicks, K no click."

Those relays are in the front (facing you) row. My '93 diagrams (same for '89 I think) shows:
J for power windows
K for head lights (this is a rather unique relay and not interchangeable with most other 5-pin types. Suggest you swap them back.

"I jumpered 87b to 30 and still no start or fuel pumps."
The "87b" means you were probably on "K", the Headlight relay, but 87b (a normally closed point) is not wired to anything on 700/900 cars.

The FI Relay is the same as 240, the White one in the next row, on the left. The "cubby" over the relays can be removed for more access (see 700/900 FAQ), but the relay can be felt (for "clicks") or removed with the cubby in place.

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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You're on the wrong relay(s) 700 1989

After getting home last night and looking at my manuals I relized I was on the wrong relays. Found the right one and it is clicking like crazy when it started this morning, he is off to where he stores his junkers to pull a relay and try it out.








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You're on the wrong relay(s) 700 1989

Here is what we believe the problem was: Just by chance my friend took out the radio suppresion relay just before he called it a night and left it inside overnight. when he reinstalled it the car ran fine. The previous owner had relocated it on the fender well upsidedown and we guess it took in some water. By sitting overnight inside where it was warm and right side up it dryed out enough to function properly. Thank you everyone for your help.








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no start (most of the time) 700 1989

Sounds like you're running on just the in-tank prepump. It supplies a little pressure, enough to start the car, but not enough to keep it going. Also check the air filter to see if it's not soaked.








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no start (most of the time) 700 1989

Sounds exactly like a no-fuel pump on issue. Did you check all the fuses? If he drove it into a deep enough street and shorted out the fuel pump, then maybe he blew the fuses, but... Then it shouldn't build enough fuel pressure to start the car.

The ECU (when it's working right) turns on the fuel pump relay and pump for only a few seconds to prime/establish pressure, then needs the rpm sensor to tell it that it needs to keep running the pump.

Someone with better knowledge can help you out with this, but I think your buddy may have fried something with the ECU or rpm sensor.
It's obviously not a total failure, if you're getting the car to run for a bit.

Does it turn on the pumps when you first insert the key and turn it to KP2?

-Will
--
1990 740 Turbo, on its way to stock specs, maybe beyond







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