Whoa, didn't mean to ignite such passion. The fact is Mel is the one who indicated he thought my fuel pressure is lower than optimal, thus robbing dynamic timing. He also indicated he runs a Holley Red for this exact reason. My apologies to Mel for dragging his name into this discussion, however when the man who has done the most development work and actual measurement of the dynamic operation of these pumps gives me something as a fact, I'm going with it. The word was 2 psi is fine from the standpoint of causing pump issues or failures but not optimum for performance. I'm getting attacked here for requesting some information, I wasn't trying to impress my opinion on anyone.
As to a couple points of discussion. I did not mount the pump under the hood because of three reasons, 2 of which are just my preference: Don't want clutter under the hood. Not that there is a documented problem, however why expose the pump to under hood heat. The actual performance related issue is that while proven capable of pulling fuel 10ft, fluid dynamics are that nearly any pump is more efficient pushing than pulling. Remember that I'm that guy that always wants not just good enough but the optimal.
We need to remember these Facet pumps were made for reliable operation on a small displacement 4 cyl engine on a ******. We are running a 444 cu in turbocharged engine at about 250 hp. Does anyone think it is strange we are feeding that through a 1/8th pipe thread fitting with likely a 3/16 id?
BTW, I don't just fool around with these old trucks (which I'm a big fan of because of reliability and simplicity) I have been working on diesel equipment since 1978. Ever wonder how the fuel in a Cat scraper gets from the fuel tank in the rear 20' foreword to the engine? Can I please go back to gathering info? Perhaps we will come up with the next optimization of the IDI platform.