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240 240's running bad after storage

Hi guys, i've had my 82 244GL and 84 240GL in storage for the past 2 years. After putting fresh fuel/batteries in them they will splutter to life(just) however they struggle to idle and stall if the accelerator is touched. They were both running great when they were parked and had fresh spark plugs and leads(minor service).

I've heard of the in tank pumps dying during storage? When i turn the key on i can hear fuel pumps humming away like they used to. Fingers crossed for an easy fix, something is just clogged up somewhere?

Any ideas would be greatly appreciated.

Cheers, Stu


  • Make sure both pumps are running not just the main pump. If your in-tank pump is dead it will show the above symptoms. Check fuel pump relays too. Are both cars acting in the same way? Two years isn't that much of a storage period.
  • Thanks @volvotragic i will jumper them this weekend. Yes both cars acting the same.

    I agree,it's unusual for them to do this, my S70 and 240 wagon started like they were run yesterday after the same storage period! Shouldn't of parked them so close to each other!
  • Assuming they're both K-Jet? Mine can take a bit of cranking to start after being left for a while, and then runs rough for a few seconds before picking back up.

    How long will they stay running for? How much fuel did you put in the tanks? I'm thinking if fuel leaks out of the injectors or fuel distributor over time it might take a bit of time to fill up.

    If you push up on the airflow plate, does it move? You could also try a shot of Aerostart or similar to help diagnose if it's a fuel or ignition issue.
  • Yes both K-Jet. Will stay running until i turn the key off, around 500rpm trying to finish off the engine mounts, i let one of them run for 10 minutes hoping it would clear up, no difference. 10L fuel in each. I ended up winching them onto car trailers as they couldn't get up the ramps.

    Will check the airflow plate when im at the shed next. Thanks @Dauntless
  • jamesincJames (@jamesinc) Oz Volvo Ice Fortress
    Do they rev up in neutral?
  • Do they rev up in neutral?

  • Ex850RSnoopy (@Ex850R) Somewhere Over the Rainbow. Melbourne.
    Sound like my old 245, it was the rubber manifold, part of the injection that had cracked letting air in, it took a great tech to find it. Stumped many other garages.
  • Is this the part @Ex850R
  • Ex850RSnoopy (@Ex850R) Somewhere Over the Rainbow. Melbourne.
  • I've heard those boots can fail, but I've never had it happen to me, so I find it difficult to believe both would fail. Worth checking, though.
  • Ex850RSnoopy (@Ex850R) Somewhere Over the Rainbow. Melbourne.
    Mine had crack that only opened up when warmed up a bit. Understanding its very old, heat affected and oily situation...
  • That would create a vacuum leak. Vacuum = closed throttle. Open throttle = no vacuum. Does it rev up when you put your foot down?
  • It also takes a while to get fresh fuel through the fuel distributor and injector lines. The factory fuel flush procedure shows why.

    Took me at least 20min running poorly to clear contaminated fuel after draining tank and main fuel lines.

    After confirming free of vacuum leaks

    - check operation of the afm plate. This could be ceased due to gummy fuel.
    - check injectors are flowing. These could also be gummed up and need cleaning.
  • Hey guys, I'm back tinkering with my 1984 240(didn't end up getting it to run)

    Here's what I'm working with:
  • Looks like i'll be replacing everything rubber if I want this thing to run well. Anyone have a 'guide' for this procedure? New injectors/seal kits? All feedback welcomed/appreciated. Cheers, Stu
  • jamesincJames (@jamesinc) Oz Volvo Ice Fortress
    Needs a bloody good clean, get a few cans of carby cleaner and go to town
  • As well as all gaskets, all seals, and all hoses
  • How crazy do I go with all this: https://www.fcpeuro.com/Volvo-parts/244/Fuel-System-Parts/?year=1984&m=4&e=914&t=5&b=5&d=36&v=11

    Should i remove the fuel distributor block for cleaning too?
  • Just do the external things first

    One thing at a time don't get carried away too quickly
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