- Joined
- Dec 16, 2016
- Messages
- 1,248
- Points
- 601
- City
- Denver
- Vehicle Year
- 2009
- Engine
- 4.0 V6
- Transmission
- Automatic
The "returnless" fuel systems still have a return. There is a pressure line to the filter and a return line back from the filter to the tank. Rather than have the pressure regulator on the fuel rail in the engine compartment, the regulator is on the fuel return line in the tank. So the filter has 3 fittings - 2 on the tank end and 1 on the engine end of the filter. Under normal operation, the excess fuel is pumped to the filter and back to the tank, rather than all the way to the engine and back.
If you don't have any return (and therefore have no regulator) your fuel pressure will vary all over depending on how much fuel you are using, since the pump pressure varies with flow - but it should be way too high most of the time.
If you don't have any return (and therefore have no regulator) your fuel pressure will vary all over depending on how much fuel you are using, since the pump pressure varies with flow - but it should be way too high most of the time.
