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Fuel distribution issues #2762568
04/11/20 06:48 AM
04/11/20 06:48 AM
Joined: Jan 2007
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Mt Morris Michigan
mopar dave Offline OP
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After a spirited first test ride of this year I had some oil leaks in the valley tray, so I remove the intake to fix and notice I have 2 intake ports in the heads soaking wet with fuel. The wet ports have no staining from the red fuel I used, but all the others are dry and stained. I use the Indy 400-3 intake and can only figure I have a distribution issue here. Cylinder intake ports #6 and #7. How to fix?

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Re: Fuel distribution issues [Re: mopar dave] #2762569
04/11/20 06:59 AM
04/11/20 06:59 AM
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Ct
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Wirenut Offline
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What do the plugs look like?

Re: Fuel distribution issues [Re: Wirenut] #2762574
04/11/20 07:24 AM
04/11/20 07:24 AM
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Mt Morris Michigan
mopar dave Offline OP
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They burn darker than the others. #7 has always been a problem.

Re: Fuel distribution issues [Re: mopar dave] #2762608
04/11/20 09:31 AM
04/11/20 09:31 AM
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Mt Morris Michigan
mopar dave Offline OP
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Anyone every see anything like this before?

Re: Fuel distribution issues [Re: mopar dave] #2762614
04/11/20 09:51 AM
04/11/20 09:51 AM
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Central TEXAS!!!!
sr4440 Offline
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I can tell you from running 10 o2 sensors, fuel distribution moves around alot, based on RPM and load. I would look at the plugs and see if they are the same, if they are i wouldn't worry about it.



Joe

Last edited by sr4440; 04/11/20 09:52 AM.

Without Data, you’re just another guy with an opinion.
Re: Fuel distribution issues [Re: mopar dave] #2762626
04/11/20 10:20 AM
04/11/20 10:20 AM
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Wirenut Offline
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Originally Posted by mopar dave
They burn darker than the others. #7 has always been a problem.


If its a carb and the plugs are not real dark like black , and if the oil dosnt smell badly of gas I wouldn't be too concerned. Judging by the heads you are using this is a hot rod , not a mild build. If its a carb its just not a perfect system . If you smell the gas in the oil quickly after an oil change you should be concerned about cylinder wash down .

Just my experience and observation.

Re: Fuel distribution issues [Re: Wirenut] #2762631
04/11/20 10:32 AM
04/11/20 10:32 AM
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N.E. Ohio
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I have dealt with this on 6bbl intakes.
Not going to be WOT fuel issue.
Idle/ part throttle and coasting.
Fuel puddling on floor and running in wet.
Small dam on runner floor fixed it for me.
Didn't effect WOT in my experience.


70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!
Re: Fuel distribution issues [Re: mopar dave] #2762635
04/11/20 11:02 AM
04/11/20 11:02 AM
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Romeo MI
MR_P_BODY Offline
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Originally Posted by mopar dave
They burn darker than the others. #7 has always been a problem.


You need to run 1 or 2 heat ranges hotter in the 2 cyls that are running fat.. just the
cyls that are fat
wave

Re: Fuel distribution issues [Re: MR_P_BODY] #2762655
04/11/20 11:45 AM
04/11/20 11:45 AM
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Mt Morris Michigan
mopar dave Offline OP
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ok, I can run a different plug I the rich cylinders. Dom suggested same thing. I could mount a turtle in the bottom of the intake as well I guess. It may be just an issue at idle, but if it was seems like all the ports would be stained red.

Re: Fuel distribution issues [Re: mopar dave] #2762660
04/11/20 11:48 AM
04/11/20 11:48 AM
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Romeo MI
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Originally Posted by mopar dave
ok, I can run a different plug I the rich cylinders. Dom suggested same thing. I could mount a turtle in the bottom of the intake as well I guess. It may be just an issue at idle, but if it was seems like all the ports would be stained red.


Dont start adding things.. one step at a time
wave

Re: Fuel distribution issues [Re: mopar dave] #2762674
04/11/20 12:24 PM
04/11/20 12:24 PM
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Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Which version is your intake, early 440-3 (round individual injector bungs,, late 440-3 or 440-3X?
They are all different under the carbs. scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Fuel distribution issues [Re: Cab_Burge] #2762783
04/11/20 05:47 PM
04/11/20 05:47 PM
Joined: Dec 2003
Posts: 531
USA
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540DUSTER Offline
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fuel pressure above 5psi floates set too high

Re: Fuel distribution issues [Re: Cab_Burge] #2762826
04/11/20 07:35 PM
04/11/20 07:35 PM
Joined: Jan 2007
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Mt Morris Michigan
mopar dave Offline OP
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I believe its a later version cab because I bought it new 4 years ago. Looks a little different now that I removed the clover leaf.

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Re: Fuel distribution issues [Re: 540DUSTER] #2762827
04/11/20 07:36 PM
04/11/20 07:36 PM
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Mt Morris Michigan
mopar dave Offline OP
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I run my pressure at 5.5psi and floats just below middle of site glass.

Re: Fuel distribution issues [Re: mopar dave] #2762858
04/11/20 08:56 PM
04/11/20 08:56 PM
Joined: Jan 2007
Posts: 8,027
Mt Morris Michigan
mopar dave Offline OP
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This video might make things a little more helpful. https://youtu.be/CBqd4WO9BzQ

Re: Fuel distribution issues [Re: mopar dave] #2762889
04/11/20 10:43 PM
04/11/20 10:43 PM
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Bend,OR USA
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Cab_Burge Offline
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That is the later 440-3, not the early one with the cast in round bungs for tapping for EFI injectors. I'm sure it is not the taller bigger plenum 440-3X either.


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Fuel distribution issues [Re: Cab_Burge] #2762945
04/12/20 08:57 AM
04/12/20 08:57 AM
Joined: Jan 2007
Posts: 8,027
Mt Morris Michigan
mopar dave Offline OP
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No, it’s not the 3x. It is a 400-3. For now I just removed the 1” 4 hole tapered and used a 1/2” wood straight 4 hole. I keep an eye on it. Never used red fuel before, so it’s working for my like a figure print.

Re: Fuel distribution issues [Re: mopar dave] #2762948
04/12/20 09:19 AM
04/12/20 09:19 AM
Joined: May 2005
Posts: 1,944
Apollo, PA.
B1MAXX Offline
top fuel
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Do you run a spacer that is modified to match the top of the manifold? Or are you putting the carb directly on whats in that picture?

Re: Fuel distribution issues [Re: B1MAXX] #2762949
04/12/20 09:28 AM
04/12/20 09:28 AM
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Mt Morris Michigan
mopar dave Offline OP
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The wilsons tapered 4 hole matched fairly well to the carb pad opening and I was following their direction with the removal of the clover leaf and putting their spacer on top. The straight 4 hole obviously covers more of the carb pad, so will see how this works out. May just be a common issue with this intake and I found it with the red dye in the fuel. Gonna call Brodix Monday and see what they say about a turtle in this intake just for curiosity.

Last edited by mopar dave; 04/12/20 09:30 AM.
Re: Fuel distribution issues [Re: mopar dave] #2762958
04/12/20 10:09 AM
04/12/20 10:09 AM
Joined: May 2005
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Apollo, PA.
B1MAXX Offline
top fuel
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I don't like the idea of a 4 hole on that just my gut reaction, that there would be reversion with 4 holes dumping into a plenum that wide open. I would run an open spacer (a cheapie) of 1"-2" inches.

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