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