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Old 11-28-2016, 10:29 AM   #1
TXswoldier
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Exclamation Leaking problems

I have an 03 CBR 600 f4i and it has been having fuel problems since I bought it. It only gets about 45-50 miles per tank. Yesterday I decided to change the fuel pump and pretty much everything inside the tank. Got it all put together with no leaks from the fuel tank....

However, something is coming from the exhaust now and I have no idea what could have cause it seeing as the fuel tank is all that I messed with. I know the hoses are connected to the correct locations.

Please help
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Old 11-28-2016, 10:39 AM   #2
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50 miles a tank is really low. All my f4is got around 200 depending how I rode it. Does it run bad. Almost seems like it's running wicked rich or you got a fuel leak somewhere.
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Old 11-28-2016, 10:42 AM   #3
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Yea it's running rich which is why i changed the stuff inside the tank..... it seems to run a little better now. Now it's just trying to fix the issue with whatever is coming from the exhaust
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Old 11-28-2016, 11:04 AM   #4
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Sounds like the vacuum diaphragm on the fuel pressure regulator is leaking.
Pretty common on the older Hondas.
That will cause raw fuel to go directly into your intake, hence the low mileage and it coming out of tue exhaust.
If you've digested that much fuel I'd change the oil too.
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Old 11-28-2016, 11:19 AM   #5
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Do you have the regulator???
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Old 11-28-2016, 11:27 AM   #6
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I will check the local dealers tomorrow since everyone is closed today.
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Old 11-28-2016, 12:17 PM   #7
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You can go to any auto parts store and get one from a Honda Civic or accord 2gen they use the same fpr
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Old 11-28-2016, 12:53 PM   #8
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Is there a year range and model fit the civic?
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Old 11-28-2016, 09:46 PM   #9
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I want to say 2nd gen just take your old one into the store and match it
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Old 11-28-2016, 10:02 PM   #10
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After changing the fuel pressure regulator, make sure you change the oil and put some new plugs in it.
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Old 11-28-2016, 11:52 PM   #11
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Leaking problems

My bet is on FPR also. Had to replace it on my 06 F4i with less than 8k miles on it. Agree change the oil and at least pull the plugs and inspect condition. The plugs may be ok but it depends how long you've been dumping that much fuel. If they are carbon coated or sooty then change them.

If not, did any of the air intake or egr tubing get crushed when you put the tank back on. I vaguely remember some easy to squish intake ducts leading to the air box but it's been a long time so that may be a different bike I'm thinking about.

Doubt it's the issue here but if you haven't yet, change out the automatic cam chain tensioner with a manual one.
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