Many common rail diesel engine faults can be traced to fuel feed pressure or volume issues but electronic on board diagnosis cannot always pinpoint fuel feed problem accurately giving confusing turbo pressure or high fuel pressure circuit related fault codes. When used correctly the 7849 can quickly diagnose a fuel feed problem. The 7849 has been designed to allow quick and easy diagnostic pressure tests to be carried out on the low pressure fuel side of a common rail diesel system with the ignition on or engine running. This kit can connect in to any low pressure fuel system that uses 9.89mm quick connectors. It can also plug straight into existing Laser fuel bleed adaptor kits including 5262, 7174, 5566 and 5567. This allows the kit to be used on Vauxhall, Renault, Citroën & Peugeot connectors as well as Ford, Jaguar and Land Rover. Diesel fuel low pressure and vacuum test kit. Fitted with clear pipes to allow easy indentification of air ingress.Supplied with 9.89mm quick connector for Jaguar, Land Rover, Ford & Citroën PSA applications. Quickly and easily measures fuel pressure vacuum and pressure. Easily identify LP fuel pump issues, fuel filter blockages, pipe damage, connection leaks & seal damage (air leaks). Can be used with the engine running to establish pre and post filter pressure variation.