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ljet euro system will not start cold after replacing the cold start valve.

I have tried everyhing any suggestions! Thanks

Does fuel squirt out of the cold start injector? There is a temp sensor on the thermostat that activates the cold start injector(check the FAQ that shows all three sensors located on the thermostat). My cold start temp sensor I know is bad but I live in Southern California so it usually starts the 2nd time. The Combo relay might be bad. That relay controls the fuel pumps. Good luck.