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......wow, just when I get one thing settled something else comes up! :(..... Anyway, after I shut my engine off I looked in the carb & fuel is pouring out of the secondary's {the back two barrels}. It runs out for about 10 seconds or so & then stops! Any ideas on what's wrong??? THANKS Everyone, Bill
I find that happens quite often if the spark plugs are too short:LOL: :LOL: :LOL:
What kind of Carb??? If it's a dual feed Holley, probably a stuck needle and seat
LOL, good one Brian!!! ;) Seriously THANKS as I needed some humor in my day!!! ;) BillQuote:
Originally Posted by brianrupnow
....Dave, yes it's a 750 Double pumper... I will go to their web site & see what it shows me as to where the needle & seat are.... THANKS ;) BillQuote:
Originally Posted by Dave Severson
Just under the adjustment screw on top of the secondary fuel bowl. It's a disease called Holleyitis.....
.....Holleyitis, he,he,he.... ;)... So I take off the big screw that I see at the back of {& on top} the secondary fuel bowl??? Then what??? What does it look like??? I went to the web site but it didn't point out a needle or seat.... BillQuote:
Originally Posted by Dave Severson
Well, the needle will have a small v shaped neoprene on it, and the seat will hopefully be a circle that the needle will go into. Take the secondary bowl off, raise the float up and blow into the fuel inlet. It should not allow air through with the needle seated. Doesn't take a very big piece of dirt to make one of these little boogers stick!!!! Check it close. At my age and deteriorated vision a magnifying glass is essential!!!!!!:LOL: :LOL: :LOL: :LOL:
..... Thanks Dave, let me go try that ;) Bill
Dont get so down I hear they work pretty good once you get them tuned in.Quote:
Originally Posted by billlsbird
If that isn't it, it will be the rubber O ring that seals the needle and seat assembly.Quote:
Originally Posted by Dave Severson
[QUOTE=NTFDAY]If that isn't it, it will be the rubber O ring that seals the needle and seat assembly.[/QUOTE
Oops, forgot to mention that dang O-ring..... Thanks!!!!!
Had to replace both of them on a 650DP a few years ago on the road, ethanol ate em up. :CRY:
I had the same problem and it turned out to be the screws in the meatering plate had backed out and would NOT lett the float go all the way up
Ron
.....THANKS Everyone, later today I'm going to pull the secondary bowl off & see what I can find. I'll check the needle, seat & O ring. Other than what you guys tell me I have NO idea what I'm doing. I just have visions of all these parts & springs flying out when I pull the bowl off! .... Oh I did read on the Holley web site & a couple of others so at least I know what the needle & seat look like & I see that 4 bolts take the bowl off... Oh I forgot to mention that this motor only has 200 miles on it. Plus it was dyno tuned in September of '06 {where it ran fine} & the Carb Shop rebuilt the carb {Sept. of '06} so I don't think any parts have worn out. The car sat after the fuel cell was installed {installed 2 years ago}. My Dad said that some dirt probably got into the fuel cell then got through the fuel filter & got into the needle & seat assembly.... He's forgotten more about cars than I know. Only problem is the last carb he rebuilt was on a flathead Ford 65 years ago..... Thanks again Everyone! ;) Bill
.....just thought of something; Am I going to have to make any type of adjustment to the carb when I re-assemble the secondary bowl??? Thanks ;)... Bill
you will have to adjust the float level again. You want the fuel just at the bottom of the sight bowl. Fuel level is adjusted with the screw and nut assembly at the top of the float bowl. Yup, same thing as the needle and seat....
Can't you just screw the needle valve assembly all the way out the top, inspect, rinse well with water, re-install and then set the float?
If the needle valve cleans up ok, pulling the float bowl is not required.
Done that one a couple of times.
Do you have a good fuel filter?
Yes you can, but if there is grit in the bowl you take the chance of it happening again.Quote:
Originally Posted by C9x
On each end of the carb, you can see a large-headed screw with a locknut. The screw adjusts float level, and the locknut holds the adjustment in place.
On the side of each float bowl, you can see another large-headed screw. that is a sight hole for determining the float level.
After you clean the needle and seat (and maybe replace it with a new Viton unit), slightly loosen the lock nut (only enough to be able to turn the float level adjustment screw) and remove the sight plug. With fuel pump pressure against the carb, adjust the float level adjustment screw until the fuel level just reaches the bottom of the sight hole.
You also might want to download the instruction manual for the carb. Go to this page find the carb and get the part number.
http://www.holley.com/types/Double%20Pumpers.asp
Then click on "Instructions" and download the manual. Here's an example:
http://www.holley.com/data/Products/...199R7923-2.pdf
Great advice here guys. Let's take it a couple of steps further without complicating things. The needle and seat have a high potential for small debris entering through the lines from the proceedure when it was installed. Most cases it's just a piece of dirt that was in the line or a piece of teflon tape, etc. It's a good idea to give the lines a "small" flush to get this stuff out. Always remember; the o-rings on the needle/seat asssembly have expanded from the contact with fuel. It is imperative that a good lubricant put applied to the orifice the part will slide into and the assembly itself be applied. The o-rings will tear and peel back if installed dry making the problem as bad or worse. If all else fails, change the darn thing with a new one, they're very affordable. I don't mind even spraying the unit with WD-40, it's fuel soluable and easliy cleanable when you put a bit too much on it. P.S. replacement steel ball units are available for these units for alchohol and other type fuels, a bit more pricey but I always run those for customers because I have no idea what they're putting into the tank.
....Ok I cleaned up the needle & seat & now it doesn't pour out when I shut the car off {nor leak out when it's running}.... BUT I'm trying to adjust the float level & fuel leaks out between the float bowl & the nut! It even leaks when I have it adjusted as far down as possible. So may be I'm doing something wrong when I adjust it??? And I just ordered the Viton Seat & Needle from Jeg's. The Viton one was cheaper than the regular one! I also ordered the needle & seat hardware kit..... So is my 'O' ring bad??? It looks ok..... Or is it one of those neoprime washers??? Any ideas??? {other than take it to a mechanic ;)..... THANKS, Bill
The needle and seat should come with a new O-ring, so that's not an issue. The carb may leak while you're adjusting, but tightening the lock nut should make it stop. If not, you need new washers to go between the nut and the carb and the nut and the adjusting screw.
There should be a gasket between the nut and the bowl, a very thin gasket, at least there is on my 650 DP.
Darn good job Jack. Picture is excellent. Reminder to the re-installilation, gaskets are essential and only made of thick paper.......very essential though!
.....ah ok, then I need new washers to go between the nut & bowl and between the nut & screw. I have the see through plastic washers & may be they dried out from sitting for 5 months. The stuff I ordered should be here on Wednesday or Thursday. So I'll have a new Viton needle & seat w/ 'O' ring. Plus the new washers {two sets probably cuz I ordered the hardware kit but the needle & seat probably already come with washers}.... THANKS ;) & I'll update after I install these,..... Bill
.....Thanks Denny, mine looks very similar to one of the pictures you posted. ;)
I just cut two new small gasgets out of some water pump gasget material that I had laying around & used them in place of the gasgets that were on the needle & seat. Guess what??? Yep, it doesn't leak anymore! ;) .... Although I doubt the material I used is gasoline proof it still shows me what was/is wrong. It's not leaking now & my new gasgets will be here in a couple of days. I guess the gasgets will last that long before the gas eats 'em up??? Anyway THANKS to all who responded!!! ;0 :) .//. Bill
....yeah, in my High School car guy days I had a reputation for over-tightening things :( so when I replace the Seat I'll make sure that I don't overtighten it ;).... THANKS for the 'heads up' on that one Denny ;).... But it's going to be tempting to NOT put the new needle & seat in cuz it seems to work!! And to adjust the float level all I did was tighten the nut down, tighten the screw down & then check the float level hole & it was PURR-FECT as is!! THANKS AGAIN ;) Bill