A suction pipe pressure detecting apparatus detects the internal pressure of {HEAD ~ the suction pipe} located downstream of {TAIL ~ the throttle valve} of the engine 
located downstream of
A suction pipe pressure detecting apparatus detects the internal pressure of { HEAD ~ the suction pipe } located downstream of { TAIL ~ the throttle valve } of the engine
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH