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Topic Review (Newest First)
07-06-2016 06:03 PM
Motas I'm running new fuel lines anyway so that's not a problem. The reason I want to do this is so its ready for a new motor down the track and I don't have to run an extra return line etc. Simply a matter of swapping the lines to the fuel rail and adjusting the pressure.

However YJs do not exist over here so I can't really get one. I've actually bought a pre update XJ fuel rail though which i found out does have a return line. Would there be any problem with blocking the inbuilt regulator and running an external one? Any ideas how I might block the inbuilt one?

Thanks, Tom.
07-06-2016 07:12 AM
jeepkevin I ran the Aeromotive #13101 on my 97 TJ with no fuel rail return. Regulator has return that I plumbed back to my fuel cell. Set regulator at appx. 45psi and that was 15 years ago. Still runs same parts to this day without issue.
07-06-2016 06:46 AM
frostytj Not sure about pre updated XJs but YJs have a built in regulator on the fuel rail and bolt onto a TJ. You'll need to run a return line back to the tank. I ran one for a while without any issues.

Buddy uses a Mallory 4305M regulator at the TJ fuel rail/firewall and return line to the tank without issues.
07-05-2016 09:32 PM
Motas Although, a little more research tells me the pre update XJs may have had a fuel rail with a return line? If this is the case I could get one locally. Would they be a direct swap and cause no issues on a TJ?

07-05-2016 09:26 PM
Fuel pressure regulator for 4.0

Hey guys,

Installed my fuel cell and my 255lph Walbro pump and am looking for recommendations on a fuel pressure regulator. It's in a TJ so have the non return fuel rail (and due to being in Australia don't want to swap) so need a regulator that will join to the return fitting on the tank. I know a ZJ filter/regulator is an option but am running all 8AN fittings so far and don't really want the plastic barbs. Happy to pay the money for a quality item that isn't going to break.


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