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Only stays running when fuel pump fuses are jumped together 200 1990

posted by philvo on Thu Aug 25 07:41 CST 2016
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last visit: Fri Aug 15 14:26 CST 2014

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My son's 1990 240 wouldn't start today and the only way to get it to tart was by jumping fuse 4 to 6. if I remove the jumper it stalls immediately. I didn't have a lot of time before work to investigate. Any suggestions? The pump doesn't buzz when I turn the ignition on.
Of course he leaves for college tomorrow....

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Only stays running when fuel pump fuses are jumped together 200 1990

posted by philvo on Thu Sep 1 17:42 CST 2016
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last visit: Fri Aug 15 14:26 CST 2014

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It was the fuel pump relay. Back in business

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Only stays running when fuel pump fuses are jumped together 200 1990

posted by TheBrickTank on Thu Aug 25 18:17 CST 2016
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last visit: Thu Oct 23 17:54 CST 2014

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Philvo,

I had the exact same thing happen to me this summer. See my link here:

https://www.brickboard.com/RWD/volvo/1634325/220/240/260/280/gremlins_fuel_system.html

You have to swap in a known good fuel pump relay first and if that does not work, swap in a known good ECU.

I had both lying around the house and it wound up being the ECU. The original one was the dreaded pink label.

After this episode I went on eBay and purchase another functioning ECU and am currently looking another as I have two bricks and I need to keep them running.

Best of luck.

Matt

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Only stays running when fuel pump fuses are jumped together 200 1990

posted by pageda on Thu Aug 25 10:09 CST 2016
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last visit: Fri Oct 24 13:18 CST 2014

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Have you tried swapping in a known good relay? Does it do the same thing?

If so swap in a known good ECU.

Dan

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Only stays running when fuel pump fuses are jumped together 200 1990

posted by pageda on Thu Aug 25 08:32 CST 2016
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last visit: Fri Oct 24 13:18 CST 2014

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I believe this happens when the ECU fails to provide the ground to the fuel relay. Do you have a pink 561 installed?
Dan

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Only stays running when fuel pump fuses are jumped together 200 1990

posted by philvo on Thu Aug 25 17:43 CST 2016
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last visit: Fri Aug 15 14:26 CST 2014

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Hi Dan,
I ended up giving my son my 1984 turbo wagon for the trip up to the university of Maine. I got the car running by jumping the fuses again and when I got it home I checked the ECU and it is not the pink label one. I will be checking all the wiring to the pumps tomorrow when I have daylight again. If the main pump was dead it wouldn't run even if jumped would it?

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Only stays running when fuel pump fuses are jumped together 200 1990

posted by pageda on Fri Aug 26 04:18 CST 2016
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last visit: Fri Oct 24 13:18 CST 2014

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What ECU do you have? And label color.

If the main pump is dead it will not run.

Dan

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NMI 200 1990

posted by pageda on Fri Aug 26 04:16 CST 2016
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last visit: Fri Oct 24 13:18 CST 2014

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Only stays running when fuel pump fuses are jumped together 200 1990

posted by philvo on Thu Aug 25 09:08 CST 2016
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last visit: Fri Aug 15 14:26 CST 2014

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Hi Dan,
I will have to look when I get home. Can I bypass a ground to the FPR?
Thanks, Phil

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Only stays running when fuel pump fuses are jumped together 200 1990

posted by pageda on Thu Aug 25 09:42 CST 2016
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last visit: Fri Oct 24 13:18 CST 2014

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Phil
This is a safety feature of these Volvos so the fuel pump stops pumping fuel in case of an accident. You can run it like you found but the fuel pump does not stop until you remove the jumper.

I have seen a work around that involves wiring another relay in place to bypass the failed circuit in the ECU. You would have to google this repair or maybe Art will see this and comments.

https://www.volvoclub.org.uk/faq/EngineFIComputer.html#ECUWorkaround

The easiest solution is to replace the ECU with a white label 951.
Dan

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Safety first! 200 1990

posted by Art Benstein on Thu Aug 25 10:18 CST 2016
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last visit: Fri Oct 17 20:10 CST 2014

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Dan, I've seen the thread but note your responses are the best advice. I'm an avid hacker yet I would not send my kid to school with a hacked repair because she may have to rely on a local mechanic to unhack it.
--
Art Benstein near Baltimore

"Freedom of speech gives you the absolute right to pose any question you like based on whatever unsubstantiated assertion you choose."

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Safety first! 200 1990

posted by pageda on Thu Aug 25 10:32 CST 2016
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last visit: Fri Oct 24 13:18 CST 2014

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Thanks Art, I agree it's not ideal and I have been fortunate to always have a good spare.

Maybe Phil has at least another 240 he can swap ECU's with to get the kid off to school and then look for a solution to his car.

I have one still in school for another year, so I am near the end of that at least!
Dan

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Safety first! 200 1990

posted by Art Benstein on Thu Aug 25 10:52 CST 2016
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last visit: Fri Oct 17 20:10 CST 2014

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My grandson just took his under-maintained '90 240 sedan 800 miles away to school. Got a text: "Hey, I made it to Illinois. But when I was 30 minutes away, my check engine light came on. 2 was 1-1-1, but 6 had 2-1-4 and 1-4-3"

Can't say bring it on by this evening... :(
--
Art Benstein near Baltimore

"It's deja vu all over again."

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Safety first! 200 1990

posted by pageda on Thu Aug 25 11:05 CST 2016
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last visit: Fri Oct 24 13:18 CST 2014

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I still have 2 that are about 90 and 130 miles from me, both in different directions. Also 2 at home.
Dan

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Meh. 200 1990

posted by kittysgreyvolvo on Thu Sep 1 20:07 CST 2016
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last visit: Sat Oct 18 15:23 CST 2014

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Three 240s, three university diplomas, no family, never married, no children.

The latter three are what make me an unpleasant person, in part, at 48 years.
--
Give your brickboard.com a big thumbs up! Way up! - Roger Ebert.

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NMI 200 1990

posted by pageda on Thu Aug 25 09:37 CST 2016
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last visit: Fri Oct 24 13:18 CST 2014

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