CK5
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Remind me what you're running for fuel delivery and FiTech model? Have you been monitoring AFR's?
Ep381 pump, 3/8 feed and return 600hp kit. Afrs stay pretty close to 13.5. Feels like it runs ok.
My afr learn is at 27% most the time.
2 different gauges told me 20 psi and the rubber line feels soft.
 
What feed and return line. What filter(s)?

3/8 high pressure fuel injection rubber tube Feed. and factory 3/8 feed line for a return. Using k&n filter. I checked the pressure right off the sending unit it was 20psi.
 
As bent mentioned. I wouldn't be surprised if a line came lose in the tank or something is up with your sock filter. Either way you're dropping your tank.
 
So why do you guys run the ep381 vs the walbro 255 ? Just curious, I know fitech specifically mentions the 255 in their faq as a good pump,

If this fitech ran this good at 20psi I can't even imagine what 58psi will do lol
 
Ok question time , I have a trans cooler with a fan, but it's smaller than the cooler I have been using? My issue is driving on the freeway without overdrive on it heats up. Logic tells me to stick with the bigger cooler vs switching to the smaller with the fan, however off-road it may be nice. What would you guys do?

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