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Power Strokes
7.3 Aftermarket
How Much Fuel Pressure?
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[QUOTE="golfer, post: 19664, member: 266"] ...as long as[B][/B] the pressure is constant/decent under load... as injector (fuel) demand increases (boost, load, etc)...fuel pressure could drop. We typically don't see injector problems (associated with lack of fuel pressure) unless pressure drops below 35psi... at higher rpm, the lack of pressure (even though it may "have" 35psi)...could cause some lack of lubricity inside the P&B assembly... rpm plays a huge role... since the TIME between injector firings can get very short (a "refill" period of 40ms @ 3000rpm) basically..at 3000rpm...the crankshaft moves 90degrees in 5ms...which means [B]AN[/B] injector will fire every 5ms...and the SAME injector (#1 for instance) will only have 40ms to REFILL before it has to fire again...not a whole heckuva lot of time to refill with low-ish fuel pressure... again...high volume LOW pressure pumps (raptor, fass, airdog) don't do so well on HEUI inj systems...since those pumps typically don't produce more than 45psi...though they can have HUGE VOLUME capability...200GPH LOL [/QUOTE]
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How Much Fuel Pressure?
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