20 seh. Injectors,relay and fuel pump pulsing

[Rob 20seh]

Hi all. My 1992 cav Sri has a problem, when ignition is turned on, pump relay clicks constantly, injectors are firing and pump is running. When it starts and clears all the fuel from the bores it runs ok,  e m l is on . 
Any help would be appreciated 

[Vauxhall Owners Club]

From memory there is also a system relay which may be stuck on causing the pump relay to click in and out to prime the fuel system, but it needs a crank signal to fire the plugs as well

[Rob 20seh]

Hi. Thanks for your reply. It’s the injectors that are pulsing along with the fuel pump. I have checked the wiring fully from crank sensor to the e c u. All fine. It does stop pulsing when the crank sensor is disconnected. I have tried a new sensor, still the same. I am thinking it may be the 

e c u. The car was  stood up for 5 years before I bough it. 

[Rob 20seh]

Hi. It was the e c u at fault. 

[Vauxhall Owners Club]

thanks for updating us and glad you got a conclusion on the problem