Test kits designed to measure the flow from the return side of common raildiesel injectors to aid in the diagnosis of poor running, engine start difficulties, poor acceleration/power lossGenerally the cylinder with the most diesel return flow is the faulty injector as it allows less fuel to the engineNo return fuel is an indication the system has either no fuel pressure or reduced fuel pressure on the primary delivery sideKits include measuring blocks with hoses, reduction pipes and adaptors for Bosch, Delphi, Denso and Siemens injectorsUser manuals includedMeasures up to 6 injectors simultaneouslyType: Quick connect style hose adaptors with glass single port measurement bottles