Product Description
Pressure Relief Valve - Long Bodied - Uprated - 156167UR
This on car adjustable Pressure Relief Valve (PRV) kit replaces the original PRV found in TR5's and TR6's. Being of a modern diaphragm design it will cure many problems inherent in the Lucas Mechanical Fuel Injection system.
The original PRV operates using the spring loaded plunger on a seat principle which is susceptible to resonance; a big problem with the original type valve when used in conjunction with a Bosch fuel pump. The added benefit of this is that braided hose, 153736SS, from the pump to PRV can be used without risk of exasperating the resonance. With the original type PRV installed a hard lined or externally braided hose will cause considerable resonance (high noise levels) so a soft rubber hose must be used.
On the original PRV the adjuster is internal and is only accessible once the fuel return pipe has been removed. This means that a real time pressure reading cannot be taken whilst making an adjustment as the fuel line needs to be refitted first. This new PRV has an external adjuster which means fuel pressure can be adjusted with the pump running and monitored at the same time.
This on car adjustable, uprated PRV is compatible with Ethanol and therefore, is safe to use with modern fuels.
The kit is supplied with full instructions and all the fittings necessary to complete the installation however the pressure will need to be set and a pressure gauge will be required (see RR1558)
This PRV kit will not fit with a Lucas fuel pump unless the pipework is reconfigured so that the PRV is moved out of the way of the CAV filter and its pipework. TR5 owners with the PRV on the chassis are strongly advised to re-engineer the pipework to conform to the TR6 arrangement where the PRV is positioned to the left hand side of the petrol tank (information is provided in the fitting instructions).