Qualcast strimmer issues

Always keep your garden tidy.

Top tips for keeping your petrol strimmer running like a ‘Rolls Royce’

  • Make sure the fuel you have in the tank is fresh and not from three years ago (it goes off)
  • Keep the spark plug gap set within the manufacturer’s tolerances
  • Lubricate all moving parts lightly with a generic spray oil each time you use the strimmer
FixItWorkshop, Worthing, May’19, Qualcast Petrol Strimmer.

Someone got in touch with a strimmer that would not start.  Anything that involves moving parts and petrol always gets my attention, so I accepted the challenge.  Once in the workshop, I tried to start it using the pull cord and as predicted, it wouldn’t run, not even a cough.  A little bit of carb cleaner sprayed in to the barrel, a pull of the starter cord and the engine did fire, suggesting that the engine could run.  More analysis was required.

The strimmer had not been started for many years, so the first job was to remove the old fuel from the tank as old fuel goes off after a while. The engine on this strimmer is a two-stroke design, so the special two-stroke oil must be pre-mixed with the fuel in the right proportion before re-filling the tank.

While sorting the fuel out, I noticed the first fault.  Both flow and return fuel pipes were cracked and one had come apart in the fuel tank, meaning that no fuel would flow to the carburettor.  No fuel, no work.

To start most petrol strimmers, mowers and chainsaws from cold, a petrol primer pump is usually used to fill the carburettor with the right amount of fuel and this one was no different, but in this case, the pump was cracked.

After fitting some new fuel lines, a fuel filter and primer pump, the engine fired up and ran well again, ready for more garden work.  See slide show.

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Cost of replacement:  £80 and up.  Cost of repair:  £7.53 plus my time and custard creams.


Author: fixitworkshop.co.uk

Hi, my name's Matt and I'm on a mission to save everyday items from the bin. Many things are repairable, but we've seemingly fallen out of love with mending things. I aim to fix that by publishing each repair I carry out in the hope that others will be inspired to repair their things and keep them for longer.

18 thoughts on “Qualcast strimmer issues”

  1. Hi hope anyone can help I’m doing a repair on my qualcast strimmer replacing the pull cord any ideas how I get it of cheers davie


  2. Hi Alex, it’s best to replace these pipes with fresh new ones as they degrade with age… new ones are tricky, but possible to fit. Have a look on ebay and measure the pipes carefully before ordering.


  3. Hi, I’ve just inherited a similar Qualcast Petrol Strimmer. Replaced the broken primer bulb, put in fresh fuel, and managed to start it, and run it for a while at idle, but when I try to throttle up, it dies. The fuel lines are old, but seem to work, and I will change the fuel filter, but the problem seems to be connected to the throttle. Any pointers as to where the problem is likely to be?


      1. Thanks – I stripped down and cleaned the carburettor, and the diaphragm was fine. Still won’t run for more than 5 seconds. The only thing I haven’t tried is a new spark plug – could that be it?


  4. Hello, I’m having difficulty with the strimmer head in as much as the strim line will not extend when tapped on the ground.


  5. Apologies, I pressed the wrong key !! I was going to ask, is there a diagrammatic view of the strimmer head showing the assembly ?


      1. Hello, I’m having difficulty with the strimmer head in as much as the strim line will not extend when tapped on the ground.
        Okay, thanks for the reply, I guess I’ll have to get the grey matter active lol


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