ROBERT BOSCH MODEL MW INJECTION PUMP
Field Test for Transfer Pump Pressure and Inlet
Disconnect supply hose by loosening connector at
elbow (Figure 39).
Install tee fitting (IH P/N 444 121) with reducer
coupling (IH P/N 444 024) and hose assembly (IH
P/N 688 187 C1) with 5/8-18 45° flare swivel
connectors at each end between elbow and supply
hose as shown in Figure 40.
Figure 40. - Measuring Transfer Pump Pressure
Connect pressure gauge at reducer as shown in
Inspect throttle linkage for any binding that can
restrict full travel of linkage or cause linkage to be
difficult to operate.
Linkage should have a slight spring override at wide
Inspect all lines and connectors between fuel tank
and injection pump. Be sure lines are not pinched,
connections are tight and valve at fuel tank is fully
Run engine at high idle (RPM).
On-Highway Truck & OEM
If specifications are not met, change fuel filters.
10. If changing fuel filters does not bring fuel pressure
into specs, a vacuum check taken at supply inlet will
measure total restriction on suction side of fuel
system (between tank and supply pump).
NOTE: If installation of new fuel filters corrects
reading DO NOT check inlet restriction.
Check inlet restriction as follows:
Install tee fitting and hose assembly (Figure 41)
between pump inlet and inlet line (Figure 42).
Figure 41. - Hose Assembly for Measuring Fuel Inlet
Connector (Part No. 118 752)
Tee (Part No. 120 280)
Standard 1/8 inch Male Connector as used
in Pressure Kit (SE-2239) or (PLT-300)
for Connection to Manometer or Gauge
Reducing Bushing (Part No. 119 933)
Hose (Part NO. 610 403 C91)
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