1990 fleetwood with 454 no fuel issue

yes the fuel pump is working I checked the fuel pressure after the fuel filter and it was like 12psi somewhere I read it was supposed to be between 9 and 13

enblethen wrote:
The fuel pump relay only operates for a few seconds to prime the system. Once the engine has oil pressure the oil pressure sending unit contacts powers the fuel pump.
I am leaning toward a power loss either ignition switch or fuse.

EDIT. I was wrong - deleted my erroneous post so no one gets misled.

Found this:



So it looks like the pressure switch does take over post-prime. Looks like you can run the pump from the ALDL.

The fuel pump relay only operates for a few seconds to prime the system. Once the engine has oil pressure the oil pressure sending unit contacts powers the fuel pump.
I am leaning toward a power loss either ignition switch or fuse.

You didn't mention the fuel pump. I hope that was an oversight because that's where you should have started. There should be a test lead somewhere that when provided 12V will close the relay and allow the fuel pump to run. If it doesn't run, bypass the relay to see if the pump runs. If the pump still doesn't run it's probably bad. As someone else mentioned, it will be an in-tank pump that requires dropping the tank to replace unless there's an access hole inside somewhere.

Moved from Forum Technical Support

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Only pressure I come up with is 56-62 PSI.
Initial prime when you turn on the ignition switch is through the fuel pump relay. It is normally located under the dog house mounted to metal shield along left side of the engine on the frame rail.Fuel pump relay
Next is to check or maybe even replace the oil pressure sending unit.Oil pressure sending unit
Verify that the fuse is good? My book says it is fuse #9. This sends power to the oil pressure gauge on an orange wire and sends power to the fuel pump relay.
Verify that your rod is moving the ignition switch.
Try adjusting the tilt on the steering wheel as it has some effect on the linkage to the ignition switch.Ignition switch

Well the most obvious thing would be the fuel pump. I believe it is located inside the fuel tank.