2008 GMC Sierra, EFI Live, Airdog 2, 30 over injectors, race valve
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I have had issue with low rail pressure for some time. Recently, I had a airdog II 4G installed but hadn’t had the opportunity to tow the camper until this weekend. When I came to a hill, the light came back on and It went into limp mode. The code says “low rail pressure” and sometimes the DIC says change fuel filter. (I have changed the filters and the water separator and cleared the DIC several times). I crawled under the truck with the key on and the engine not running. I couldn’t hear the pump running but it was vibrating slightly. Is that normal? My old fass pump made a lot of noise. I turned the pressure up but it didn’t make much difference. And advise would be appreciated.