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  1. Hammer166

    Volvo 630 rough starting

    If it was me, I'd give the suction side of the fuel system a once-over first. Throw a wrench on the fitting make sure everything's tight, make sure all your hoses don't look like they're getting bad. If you have a clear Dome filter, check and make sure you're not getting a lot of air bubbles...
  2. Hammer166

    Volvo 630 rough starting

    Your losing prime in the fuel system. It could be the check valve on the return line, or on that old of truck, it could be a small leak on the suction side that breaks the vacuum and allows fuel to drain back. Worst case scenario is an injector not closing properly and dripping fuel into a...
  3. Hammer166

    Volvo 630 rough starting

    Don't be an ass! Bad fuel return check valve is only the most common cause of hard starting since the advent of the electronic engine in the 90s
  4. Hammer166

    Volvo 630 rough starting

    Is it cranking longer than normal before it does try and Fire?
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