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CB7 fuel pressure issue

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    #16
    Just because the pump is running doesn't mean that there's enough pressure to run the engine.

    My original pump had a audible whine when running but would only put out about 20 psi (enough to run the engine, but not well). But, even with this weak pump, it moved a LOT of fuel when the rubber feed line was disconnected and the pump run.
    1992 EX, 306,000 miles - Track toy - M2S4, H23A1, ST rear swaybar, Wagon brakes, GC coil sleeves, KYB AGX dampers, Stoptech pads, Toyo Proxes R1R, 2.25" exhaust



    Stock F22A6
    VIR, 5/22/2016: https://youtu.be/eR5-ylSPsxk

    H23A1 powered
    NCCAR, 9/4/2016: https://www.youtube.com/watch?v=TI5WpxGrEpE
    CMP, 10/16/2016: https://youtu.be/DOqoe5f-GLY

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      #17
      Originally posted by masospaghetti View Post
      Just because the pump is running doesn't mean that there's enough pressure to run the engine.

      My original pump had a audible whine when running but would only put out about 20 psi (enough to run the engine, but not well). But, even with this weak pump, it moved a LOT of fuel when the rubber feed line was disconnected and the pump run.
      i have just put in new fuel pump and i have gas flow now directly from that line that connects to fuel filter,i also hooked up fuel pressure test after new fuel pump install i hooked up to the outlet with a 14mm bolt on fuel rail when i took off bolt there was fuel coming out of fuel rail but when i did pressure test during priming and when engine is cranking over there was still 0 pressure and still no start with new fuel pump

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        #18
        If you're getting fuel to the rail but not to the cylinders, it's possible that your injector resistor box has failed.

        It's also possible that one of your new parts is bad. Never discount the possibility that a new part can be faulty. I've seen people pull their hair out and go broke because they refused to suspect a potentially faulty new part!






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          #19
          Originally posted by deevergote View Post
          If you're getting fuel to the rail but not to the cylinders, it's possible that your injector resistor box has failed.

          It's also possible that one of your new parts is bad. Never discount the possibility that a new part can be faulty. I've seen people pull their hair out and go broke because they refused to suspect a potentially faulty new part!
          hey so im going out on Sunday and pulling a resistor box from pick-n-pull when installed if this doesn't fix the issue what else could i pull off a old car to save me a trip back to the yard i know its an odd question i have done everything i can think of i even went back and tested all new parts and everything is on point....

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            #20
            Originally posted by Nomad93 View Post
            i have just put in new fuel pump and i have gas flow now directly from that line that connects to fuel filter,i also hooked up fuel pressure test after new fuel pump install i hooked up to the outlet with a 14mm bolt on fuel rail when i took off bolt there was fuel coming out of fuel rail but when i did pressure test during priming and when engine is cranking over there was still 0 pressure and still no start with new fuel pump
            Clamp the return line from the pressure regulator, then recheck the pressure when the pump is running. If the pressure is in the 60 psi range, then your pressure regulator is probably bad.
            90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
            08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums

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              #21
              Originally posted by deevergote View Post
              If you're getting fuel to the rail but not to the cylinders, it's possible that your injector resistor box has failed.

              It's also possible that one of your new parts is bad. Never discount the possibility that a new part can be faulty. I've seen people pull their hair out and go broke because they refused to suspect a potentially faulty new part!
              went to the scrap yard today and pulled three injector resistor boxes and still no start would it be a bad idea to pull fuel rail of with injectors attached and crank it over to see if they're spittin?

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                #22
                Be sure to cover all sensitive things, including yourself, and anything painted. I'm not sure how far it'll shoot! Be sure you're out in the open, with nothing that could ignite the fuel. But yeah, it's worth a shot. Never heard of anyone doing it that way. I'd be curious to see the outcome. It'll definitely show what injectors are firing.






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                  #23
                  Originally posted by Nomad93 View Post
                  went to the scrap yard today and pulled three injector resistor boxes and still no start would it be a bad idea to pull fuel rail of with injectors attached and crank it over to see if they're spittin?
                  Better rig up a way to keep the injectors clamped to the rail, otherwise (if you have pressure) it is liable to pop all the injectors out of the rail and then you'll really have a mess and a FIRE HAZARD.

                  Did you check if you have pressure with the return line clamped?
                  90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
                  08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums

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                    #24
                    You can take the injectors out and hook power and ground to each one you can hear if they are clicking or not

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                      #25
                      Originally posted by fleetw00d View Post
                      Better rig up a way to keep the injectors clamped to the rail, otherwise (if you have pressure) it is liable to pop all the injectors out of the rail and then you'll really have a mess and a FIRE HAZARD.

                      Did you check if you have pressure with the return line clamped?
                      hello everyone who has been helping me get through to the source of my crank and no start situation.... I HAVE SOLVED THE ISSUE!!!!! i had my car towed down to work and not even two minutes of it being in the garage and being swarmed but all my fellow techs that were wondering why the hell i couldn't get it started this whole time we had it started. the IACV that plugs into the injector rail to power injectors had corrosion and was not getting any power because of this. simply cleaned corrosion plugged in and she fired right up
                      thanks for all the reply's and help!!

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