I have a 2003 Winnebago Adventurer with a 8.1L Vortexc engine. The problem is the same as a previous question regarding fuel rail pressure climbing up to the proper level and then the pressure is rapidly lost. The engine cranks fast, but it t is slow starting. I disconnected the vacuum line from the regulator to the manifold, cranked the engine, and fuel was coming out of the fuel regulator, even though the engine didn't start. Does that mean the regulator is bad and that's why I'm losing pressure? Thank you.
( Ron Johnson, 04/02/2026 )
Hello Ron, sorry for the delayed reply ( we just spoke on the phone) and that is definitely a failed regulator .
When I connect the fuel pressure gage to the valve on the rail and turn the key on, I get a pressure at 60 psi but it immediately bleeds off. Is it the regulator or the pump?
( Doug Lucas, 12/11/2025 )
This is normally an issue with the pump as it has an internal check valve to hold the pressure. If your chassis is a 2001-2003 and has the external regulator up on the fuel rail, you can disconnect the vacuum line from the intake manifold and start the engine to see if any fuel comes out of it, there should not be any.
what is the rated psi for this regulator or
for the 7.4
thank you
( michael Uva, 06/03/2022 )
56-62 PSI
Does this regulator have the pressure adjustment screw on top?
( Timothy L OReilly, 10/28/2020 )
Hi Timothy, they no longer have that, they are pre-set .
Where is the fuel pressure regulator #19245530 located on my ‘2003 Newmar K/S W-22 gas coach? Thank you, Dan
( Daniel Broadwater, 07/07/2020 )
The fuel pressure regulator is located on top of the engine, towards the back of the driver side valve cover. It will look like a small dome with a vacuum line attached to it going to the intake manifold.