If you know your vehicle has sufficient spark, and the timing is set correctly, but it still won’t start, the problem is likely with the fuel supply. In that case, the Maddox fuel injection service kit that Harbor Freight sells for $39.99 will help you diagnose issues with your fuel system. It includes a dual-scale gauge that reads pressure up to 100 PSI (700 kPA) and an assortment of fittings, hoses, and adapters for most vehicles. There is also a pressure relief valve with an attached hose to safely release pressure from your system and avoid troublesome sprays and leaks that could potentially cause a fire.
The kit includes everything you need to perform running, residual, rail and flow rate pressure tests and a molded plastic carrying case to keep all the pieces organized. It has an average customer rating of 4.7 out of 5 stars, and 97% of Harbor Freight buyers would recommend this test kit to others.
