TM 5-3805-262-34TESTING (SHEET 2 OF 3)(4) Close gage valve.(5) Flush fuel injector by working test stand pump handle rapidly.NOTEWhen testing more than one fuel injector, there shall not be more than100 psi difference in opening pressure between injectors.(6) Check fuel injector opening pressure as follows:(a) Open gage valve and raise pressure slowly until fuel injector valveopens (pressure gage reading will fall sharply at this point). Recordopening pressure.(b) If opening pressure is not 3400 to 3950 psi for used fuel injectors or3950 to 4100 psi for new fuel injectors, notify general support mainte-nance (fuel injector must be adjusted). If opening pressure is as speci-fied above, go to step (7) below.Always direct injector tip away from you. Fuelpenetrate clothing and skin causing seriousfrom spray orifices caninfection. Always be sureinjector tip is enclosed in a receptacle (preferably transparent) tocontain spray. If skin is broken by fuel injector spray, immediatelywash injured part with boric acid solution. Support injured member witha splint and sling so it will remain absolutely at rest. Obtain medicalattention immediately.(7) Check for valve seat leakage as follows:(a)(b)(c)(d)Work test pump rapidly to seat valve firmly.Dry fuel injector nozzle tip using clean cloth.Raise fuel injector pressure until pressure is 100 psi under openingpressure recorded in step (6)(a) above for five seconds and watch nozzletip.If drops form on fuel injector nozzle tip (slight dampness is permit-ted), notify general support maintenance (fuel injector must be repair-ed). If drops do not form on fuel injector tip after five seconds, go tostep (8) below.3-111
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