95 rodeo. not the Diesel right>? gasoline engine, the diesel has a timed pump....GAS:what engine? car has 2 or more as options... and fuel systems vary by ,(drum roll) engines.my guess is this is your first EFI fueling system?to test fuel rail pressure and its zero, this must be done cranking, i bet you didnt know that 1/2 the carsmade, it must be cranked to get the pump to run..... right?my second guess, is you dont own a $10 volt meter.?the engine has a ECU, this ECU sends 12vdc to the fuel pump using a Fuel pump relay.does the relay close, cranking?1/2 do just key on for 2 seconds.while cranking. and running. so we use a voltmeter to see if that happens, not replace every part on car gue$$ing, wow are you rich?The ECU/:PCM brain can cut fuel for 2 or more reasonsMore facts:the ecu cuts fuel cranking if the throttle is stuck wide open. (TPS sensor errors, do that....) (this is a FEATURE)this is a "unflood feature in all EFI cars made" (modern say 1988 to now)"a feature stated in the operators guide, btw)and if the ECU has an immobilizer OPTION, same thing, cuts fuel. (some cars cut fuel then spark)the ECU also cuts fuel if the ECU even suspects spark is missing. (feature 3)Does engine run on test fueL. we do that first. the 3 second test fuel tests.if that sounds good, we attach fueling next.if it sounds bad, or engine is dead, we fix that next (timing belt slip?)This feature prevents the crash and burn deal.. as seen on T.V... (ecu computer logic )(and is by laws here... (called the Spark monitor inside the ECU...)got 12vdc to the pump cranking, ?at the pump 2 wires. not 6v, no 8v but at least 11vdc there... (it will be whatever battery volts are... cranking, (measure that too)on cars that need to be cranked, to get pressureyou will ru not be able to hear the pumpn, with the Starter motor banging away.... so we use the volt meter and the fuel pressure gaugeto not get fooled... Dribble tests are ok, if no dribble cranking, but is in no way proof of good pressure.. if pump runs....The injector dont work at 0 to 20PSI, sorry...on some cars you get a prime pump action for 3 seconds, keyon.but not all cars do that. so we just assume they dont and WIN. (Isuzu diffr, rules on diffr. engines.... sure are...)got a meter? even a $10 walfart meter works..end general rules and vast experiences...------------------------------------------------now the FSM pages, of facts: (factory serv. man)the 2.2L runs for "2 seconds key on",this is the prime signal.its best to repeat it 3 times to build pressure from a breached system. (gauge breached it)quotes from FSM: 3.2LTurn the ignition ON and listen for the pump to run (it should run for 2 seconds). If necessary, cycle the ignition OFF for 10 seconds and then ON again, in order to build maximum system pressure.2.2LNote the fuel pressure with the pump RUNNING; it should be 41–47 psi (284–325 kPa). When the pump stops, pressure may vary slightly, then should hold steady."now the other engine. 3.2Lit say it needs to be cranked or run to checkfuel pressure. in my book.the fuel rail at the loop end has the fuel pressure test port. there. see it?seen here,41-46psi is running pressure,(or cranking)and 35psi for the smaller gas engine.the pressures matter, its not carb car its EFI.do not be tempted by the dark side and hot wirethe fuel pump relay, if you do , most guysburn to H3ll the ECU relay driver, ive repair so many ,its a crime.they hot wire this relay socket slip for a second and boom, you just blew up a $400 ECUpay me to fix that..... (nah , im retired, )never hot wire, the EFI system.
if you have water leaking, finding it is easytry this. works on all cars... (not air cooled)1: start car and let it warm up.2: all cars the water pressure rises to about 14psi, 3: when fully warm the 14psi will in fact leak at all leak points.4: and if you just stand there and look, even cut engine offyou will see the exact point of said leak, if you actually look and not gander from afar. hose can squirt, heck all class failures can do that.and can land on things that are not even water related.that is why this test above wins.if all this sounds scary and not wanting AF 50% fluid in the eye/?why not get the car serviced, let them burn handand get squirted in eye, or get neck tie in fan.>?>>>>LOL
"isuzu introduced the five-door Isuzu Rodeo to the United States in 1990 for the 1991 model year. It was available with either a 2.6-liter inline-four engine rated at 89 kilowatts (119 hp) or a 3.1-liter V6 engine made by General Motors (GM)"
