If your IP came from a car with not Turbocharger there is no Rack Damper Bolt on the IP.

Try putting on a longer Fuel Inlet hose and running the hose to a seperate can (like a 2.5 liter spare fuel can) of Fuel instead of your Fuel Tank. This will remove anything to the rear as a source of the problem.

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84 300D, 82 Volvo 244Gl Diesel