Maximum fuel pressure?
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Maximum fuel pressure?
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In any case, our standard pintle valve injectors will lock up at higher pressures, because the magnetic coil can't generate enough power to open the injector against the fuel pressure holding it shut. 70 psi is the number that is usually tossed around, but testing it should be pretty easy. Just wire an injector up to an MS on the stim and start jacking up the pressure on a test fuel rig until the injector stops working.
Eric