TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

TM 9-2815-220-34 Tobie 2·2. Troubleshooting ocedures - Continued Malf un<llon Fuel System Ahnormnl Condilions - Continued 14.7 Engine ruel supply pump defective: PraJ e <au, e. Electric fuel shutoff failure. (Electric circuit dective or lenoid failure). f. Manual fuel shutff malfunction (im· proper control linkage adjustment or internal failure). g. Fuel control stuck in "no . fuel" position (reult of improper preseative oil during long term storage and cu during initial start when engine Is stopped because of resulting over· speed). h. Fuel injection pump drive coupling failure (pump not rotating). I. Pressure regulating valve (fuel return) dective. j. Fuel leakage internally (hydraulic head gasket or housing porosity leaks fuel into engine oil ). k. Injection pump liming improper. I. Fuel injection pump internal failure. a. Fuel pump failure (insufficient fuel out· put due  defective regulating valve, internal pump wear or shart al leak causing fuel leakage into engine oil). rrc li vr act i on el. Check solenoid operation. Refer to DT·S.1. e2. Check circuit voltage. Refer to perti- nent vehicle technical manual. e3. •Replace fuel injection pump cover and solenoid assembly (rder to perti· ne nt inject ion pump technical manual or replace fuel injecti on pump \para 2- 21). fl. Check manual operation (refer to DT·5·2). . Check control for full tra\'el or discon- nected linkag. Adjust or r•·11ir a� required (parn 2·21). (3. •Remove fuel injection �lump shut-off co1•er and inspect lever opcrntion. If deicclive, replace co1·er �1:1111Jly (refer lo pcni nent fuel injection pump tet'hnical manual) or replace fuel injection pump (para 2-21). gl. Operate engine fuel shulff (electric and manual separately) six or eight times. This may free foci control from stuck position. Attempl l' nginc start. g2. Check rucl injtlion operation. Refer to DT·l.5. g3. Remo\•e fuel shutff cover anJ inspect fuel control levers (lever is stuck when in extreme right position). Refer to pertinent fuel injection pump technical manual. g.t. · Manually move lever to the left, counter clkwise, and alternately rotate (both directions gradua11y) un. tit full travel and co mplete freene of lever is obtained. g5. Reinstall fuel shutff cover and chcrk engine for normal start. g. •tr engine falls lo start, replace rue! in- jection pump (para 2·21). hl. Check fuel injection pump rotation. Refer lo DT-3.2. h2. •Replace fuel injection pump (para 2-21). ·il. Check fuel pressure. Refer lo OT·l.3. i2. If 1·alve is defective, replace vah•c. Refer to . riertinent fuel injection pump technical manual. j. •Replace fuel injecti on pump (para 2-21). k. Check Liming (para 2·21). I l. Check fuel injection pump operation. Refer lo OT -1.5. 12. Replace injection pump (pa· ra 2·21 ). NOTE Remove and bench lest all noizles (DT-2.2) after inj- tion pump intal failure. a I. Check fuel pressure and refer lo DT-1.4. a2. Repair or replace defective fuel pump aembly (para 2-21). 2-19