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Power Strokes
7.3 Aftermarket
Boost reference on the fuel regulator
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[QUOTE="TARM, post: 38950, member: 578"] While it may not have effected your hp I do wonder once over 3k on motors that are running all the pw they have window for with 400% and larger nozzles if they are getting complete refills @ only 45 psi. I do not know where that wall is but as rpms go up the window to refill goes down. Considering a fixed injection volume or pw icp the more minimum pressure you are going to need to refill the same volume. That may not show up on a 3 second wot dyno run but in a 1/4 or on the street that lose would become cumulative and you could end up with an issue. While there are always possibilities. Of issues such as runaway fueling has it ever happened that anyone can recall where someone blew the diaphram and ended up blowing their engine from it? (BTW that was not meant to be retorical or a SA comment) Not saying it can not happen but wouldn't you think if this was a reasonable risk you would see more posted on it by the gassers etc. I would think a check valve in the air regulator would eliminate much of the risk as would the choice of boost tap location to make sure gravity would take it away from not into the heads. Also as we are using boost not vaccum a leaking diaphragm would have the fuel pushed out of it by the boost not up the line and if the leak was so large to put fuel say the full fuel pressure to the hose woukd that not cuase a huge drop in fuel pressure into the heads and thus injectors. I would think a one way air/fluid/oil check valve between the air reg and fuel reg would remove most all the threat of fuel blowing into the manifolds. Not sure if they are diesel compatable but are made of an alloy for use with air/water/and oilsa nd can be had for 6-10 dollars. Its not like we are looking for long term exposure here anyways just a stop gap to preventis in the smal chance it happens. Especially for pumps that use brushes and culmulators etc the lower the pressure the lower the volts the less eroding wear of the parts. On any motor the less work the longer the duty life. Being able to run 45psi instead of 40% all but at those times under boost that much longer the pumps live as I see it. Maybe I am wrong but it makes sense at least on its face to me. 45 psi base pressure boost ref port > hose > one way check valve > hose > air reg set to 20 psi (or boost fooler would work as well) would set max fuel psi to 65psi @ 20 psi boost and higher > hose > boost tap locaton. If one of the first sections was clear hose you would have clear sight of any fuel infiltration at a glance. As long as it can handle 20 psi and the heat right at the reg which is not bad where mine is at it should be ok I would think. Have not looked to see what ratings clear hose can have. [/QUOTE]
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Boost reference on the fuel regulator
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