Fuel Pressure Issue

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MtyMseHarmer

New Member
Messages
13
Location
Topeka
Having a fuel pressure problem on my 1UZ swap. Engine is 94 1UZFE from LS400. I put on a new external Walbro 255 pump. Just recently put on an aeromotive adjustable fuel pressure regulator, -6AN lines and russell fuel filter. Set the pressure to 40 psi at idle with the vacuum line disconnected. Connect it back and when I rev the engine the pressure will raise slightly but at 2K RPM it drops to about 20 psi and wont let me rev past 3500-4K RPM.

Does this sound like maybe the pump isn't working correctly?
 

cribbj

"Supra" Moderator
Staff member
Messages
4,794
Location
Houston, TX
Try swapping one thing at a time until you find the culprit.

It almost sounds like a restricted return line, or the Aeromotive is sticking.
 
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