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I have a 2012 Honda CBR 250r with 6600 miles. Bike was running fine when I parked it it in the garage. Woke up next morning to go home and it wouldn't start. Troubleshooting I got it to run for a few seconds using starting fluid but it wouldn't stay going. Decided it was probably the fuel pump so I replaced it. When replacing it I found out it had been previously replaced. Now when turn the key you can hear pump running but it won't actually pump. Check the codes and got error codes 12 and 29. Fuel relay fuse is good and even tried to bypass the fuel filter with clear tube only to discover it isn't pumping still. Any other suggestions would be really appreciated
 

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Hi Chris!

Did you actually test fuel-pump to see if it's working?

1. disconnect fuel-hose from fuel-rail and aim into measuring cup
2. turn key ON and fuel-pump should prime for 3-seconds, did you see petrol flow into measuring cup?
3. crank engine for 10-seconds. How much petrol did you collect in cup?

There may be wiring-issues with weak or no power going to pump. In which case, you can replace pump with 10, 20 new pumps and none of them will ever flow enough. Most important part of troubleshooting is testing and measuring and examining numbers. Key here is now many CC of petrol pump flows in 10-sec.
 

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DTC 12 is fuel-injector issue. DON'T buy new injector and swap it in!!! Sure it may be injector, but likely problem with wiring:

1. disconnect injector connector. Turn key ON. Measure voltage between black/blue wire and ground. What is voltage?

2. Turn key OFF.. Measure resistance (ohms) between pink/white wire and ground. What is resistance?

3. Measure resistance between 2 terminals of fuel-injector. What is resistance?
 

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Definitely do some checking, but is it an aftermarket pump?

There have been numerous issues with new aftermarket pumps not working properly.

If it is the pump, be very careful what you purchase. There are some threads here with more info and a recommendation on one of the better aftermarket pumps. Also check the price on an OEM pump from Honda. Sometimes there is very little difference in cost.

Make sure the tank is clean on the inside before installing a new pump. It seems like debris can get past the filter and damage the pump quickly.
 

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DTC 29 is IACV (idle valve)

1. disconnect idle-valve connector

2. measure resistance between connector terminal and ground:
  • blue/white to ground resistance = ?
  • brown/white to ground resistance = ?
  • brown/black to ground resistance = ?
  • blue/black to ground resistance = ?
3. disconnect ECU connector and measure resistance between harness wires end-to-end (between ECU & IACV connectors):
  • blue/white end-to-end resistance = ?
  • brown/white end-to-end resistance = ?
  • brown/black end-to-end resistance = ?
  • blue/black end-to-end resistance = ?
4. measure resistance between terminals of IACV itself:
  • #1 & #4 terminals resistance = ?
  • #2 & #3 terminals resistance = ?
 

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Yeah, unless you bought brand-new OEM pump from Honda dealer, it's suspect. You have to TEST flow-volume to verify pump is actually flowing sufficient petrol. Many, many 3rd-party parts are bad right out of box, or they may be OK for little while and end up failing. Again, TESTING actual flow-volume will tell you if pump is good or bad.

Then there's also testing fuel-pressure...Many pumps may flow sufficient volume with no load into measuring-cup. But when end of hose is closed (connected to fuel-rail) and pressure is required, they may not flow sufficient volume under load. There's test for that too with numbers...

All above testing steps are straight out of manual. If you take bike to dealer, this is is what dealer mechanic will do. Consult manual and go through troubleshooting step-by-step.
 
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