Clay Smith Fuel Pump?
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Clay Smith Fuel Pump?

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    The Good mrjoshua's Avatar
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    Default Clay Smith Fuel Pump?

    I've been fighting a lean condition with my mild 468 BBC. I had a 850 dp on a dual plane and was getting some popping at wot. I've jetted up all the way to 88 on front and back. Plugs still looked to lean. I switched to a single plane and the problem was of course worse. I also lost 300 rpm. I tried a 1050 Dominator with 84's. Still popping. We re jetted all the way up to 87/95 just to see if we could get black smoke. Still lean and popping. Ran into a buddy at the lake who's friend was a mechanic. He did not like my fuel filter set up. I had it in front of my edelbrock hi volume fuel pump instead of after. He seemed to think this would severely worsen my psi. At 4000 rpm I'm only getting 5.5 psi at 5000 it falls to 4 psi. I know I need to move the filter but does it sound like like I might need a bigger/ better pump such as a Clay Smith? Will I then need a regulator? What sort of psi do I need for a lake boat? Right now I have dual inline filters from each tank. I only run one side
    at a time. This has been an issue since the tanks were cleaned and had all new fuel lines and parts. No I have not checked the filters yet. Not interested in electric, I would prefer to stay mechanical. Let the flogging begin.

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    Quote Originally Posted by mrjoshua View Post
    I've been fighting a lean condition with my mild 468 BBC. I had a 850 dp on a dual plane and was getting some popping at wot. I've jetted up all the way to 88 on front and back. Plugs still looked to lean. I switched to a single plane and the problem was of course worse. I also lost 300 rpm. I tried a 1050 Dominator with 84's. Still popping. We re jetted all the way up to 87/95 just to see if we could get black smoke. Still lean and popping. Ran into a buddy at the lake who's friend was a mechanic. He did not like my fuel filter set up. I had it in front of my edelbrock hi volume fuel pump instead of after. He seemed to think this would severely worsen my psi. At 4000 rpm I'm only getting 5.5 psi at 5000 it falls to 4 psi. I know I need to move the filter but does it sound like like I might need a bigger/ better pump such as a Clay Smith? Will I then need a regulator? What sort of psi do I need for a lake boat? Right now I have dual inline filters from each tank. I only run one side
    at a time. This has been an issue since the tanks were cleaned and had all new fuel lines and parts. No I have not checked the filters yet. Not interested in electric, I would prefer to stay mechanical. Let the flogging begin.

    New Clay Smith BBC 1/2 pump is $155
    We can Also rebuild and machine the Edelbrock pump assuming its a 6 valve deal for $90
    And YES you will need a regulator for the clay smith pump. We are recommending a by pass check valve unit with a return back to the tank. We use and sale Enderle's

    Good Luck, And call if you need anything.

    Nic
    714 523-0530

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    gn7
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    Quote Originally Posted by mrjoshua View Post
    I've been fighting a lean condition with my mild 468 BBC. I had a 850 dp on a dual plane and was getting some popping at wot. I've jetted up all the way to 88 on front and back. Plugs still looked to lean. I switched to a single plane and the problem was of course worse. I also lost 300 rpm. I tried a 1050 Dominator with 84's. Still popping. We re jetted all the way up to 87/95 just to see if we could get black smoke. Still lean and popping. Ran into a buddy at the lake who's friend was a mechanic. He did not like my fuel filter set up. I had it in front of my edelbrock hi volume fuel pump instead of after. He seemed to think this would severely worsen my psi. At 4000 rpm I'm only getting 5.5 psi at 5000 it falls to 4 psi. I know I need to move the filter but does it sound like like I might need a bigger/ better pump such as a Clay Smith? Will I then need a regulator? What sort of psi do I need for a lake boat? Right now I have dual inline filters from each tank. I only run one side
    at a time. This has been an issue since the tanks were cleaned and had all new fuel lines and parts. No I have not checked the filters yet. Not interested in electric, I would prefer to stay mechanical. Let the flogging begin.
    Your buddy is right. Get the filters of the inlet side of the pump. You can run a inlet filter, but you need to make sure it has a rather large micron rating and it pretty good sized. Sucking thru a filter quite frankly, SUCKS. Also you need to make certain the size of yoru lines in and out are up to the job. This means the dip tubes in the tanks if it has them, any shut off valves, all the lines leading to the pmup,amd to the carb. Everything BEFORE the pump is actually more critical than AFTER.

    As much as I like the Clay Smith pump, don't me so quick to pass blame on your current one. Even a Clay Smith can't deliever 1000 HP of fuel thru a soda straw. Specially if the soda straw is on the inlet with some .50 cent filter stuffed in it/



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    I had a similiar problem all last year with my BBC w/ a Victor Jr. single plane intake. I kept increasing jet sizes and the motor would stay lean. I had to resort to backing off on the timing temporarily until I ended up fixing the problem this past winter. I found an article on the web and I believe it was written by Hot Rod Magazine. It talked about setting up a fuel delivery system and made mention of how 90 degree fittings could be a source for restriction. I totally re-did my fuel delivery system and I set it up in a way to where I was able to go from (4) 90 degree fittings to (1) The result was better fuel pressure and no more popping with my timing set to where it should be. I also bought a larger water fuel/water seperator head from CP Performance which allows me to run a much larger 10 micron fuel/water seperator filter. After the fuel pump I run a fuel filter of which I have no Idea of the micron count. I have no idea as to what will it take to fix your problem. What I mentioned fixed mine and since I had the same exact problem as you and since I run the same fuel pump I decided to post it. I'm just saying this because on this site my ideas often get questioned or struck down by certain members...
    Last edited by N2GLOCK; 09-10-2012 at 09:30 AM.

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    Thanks for the responses. We also kept upping jet size daring the thing to smoke Stopped with 87/95's on a 1050 at 4500' elevation still popped. Gonna look for gremlins in the fuel delivery and lines.

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    gn7
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    Quote Originally Posted by mrjoshua View Post
    Thanks for the responses. We also kept upping jet size daring the thing to smoke Stopped with 87/95's on a 1050 at 4500' elevation still popped. Gonna look for gremlins in the fuel delivery and lines.
    .097 needle and seat assemblies will have a hard time keeping up with that much jet at 4 psi as well. I never run a neeedle and seat in a dominator smaller than .110



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    Cool thanks for all the responses.

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    Senior Member Bigblockbill's Avatar
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    Look at the tank pick ups too. Some of them things are only 5/16" and if your drawing off just one tank at a time it is not enough.
    24' Eliminator Fundeck

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    Never restrict flow to any kind of pump, screen only. I run 2 equal length #10 lines to a 't' through a screen type filter to a $29 dollar airtex (70 vette 454) with the bypass plugged (7 psi)and 3/8 lines to 660's on .700 lift 427. It will run 6500 continuous until the tanks are dry and ya have to paddle the last 50 yards to get it back on the trailer and never have a problem
    "A liberal paradise would be a place where everybody has
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    Quote Originally Posted by mrjoshua View Post
    I've been fighting a lean condition with my mild 468 BBC. I had a 850 dp on a dual plane and was getting some popping at wot. I've jetted up all the way to 88 on front and back. Plugs still looked to lean. I switched to a single plane and the problem was of course worse. I also lost 300 rpm. I tried a 1050 Dominator with 84's. Still popping. We re jetted all the way up to 87/95 just to see if we could get black smoke. Still lean and popping. Ran into a buddy at the lake who's friend was a mechanic. He did not like my fuel filter set up. I had it in front of my edelbrock hi volume fuel pump instead of after. He seemed to think this would severely worsen my psi. At 4000 rpm I'm only getting 5.5 psi at 5000 it falls to 4 psi. I know I need to move the filter but does it sound like like I might need a bigger/ better pump such as a Clay Smith? Will I then need a regulator? What sort of psi do I need for a lake boat? Right now I have dual inline filters from each tank. I only run one side
    at a time. This has been an issue since the tanks were cleaned and had all new fuel lines and parts. No I have not checked the filters yet. Not interested in electric, I would prefer to stay mechanical. Let the flogging begin.

    For what its worth...my clay smith fuel pump has performed flawlessly....got it from superdave here on the boards. Been biting my tongue here for a bit...but this pop at wot...is it at the same r's every time...or is it more intermittent. The 1st thing I thought of was an intake valve thats too tight....has that been ruled out already?? Carry on
    Another Hot Boat refugee

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    Default Where is the "pop"...

    Are you saying it's popping through the carb?? Or popping out the exhaust??? 4 PSI, although somewhat low, is still a positive pressure.... As Bob mentioned, you may be up against a volume issue, not a pressure issue..... If you have side tanks, chances are the ID of the drop down pickups is less than 1/4", (5/16ths - the wall thickness Xs 2)..... You could have 10 psi at your gauge, but if you're forcing it through the eye of a needle, the volume can't cut it..... Since you've tried two totally different carbs, jetted to the moon, with little change, or little success, IMO, you should be looking at delivery..... Also, are you pulling from two tanks? At the same time?
    Ray
    PS IF it's popping out the exhaust, disregard all the above......^^^^
    LOUD BOATS SAVE LIVES

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    New engine and valve train. Heads were machined. The lean popping occurs intermittently but consistently at wot. If it is hard of the line then it's probably from 4000 rpm and above. If on plane cruising then its 4700 rpm or so and above. If I roll easy from the start it won't really start to pop until 6/8 to 7/8ths throttle.

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    Yes popping out the exhaust. One tank at a time. Down tubes are probably that small. Tanks have flip top caps. No vents. On the trailer the other day with both tanks on at 3500 rpm only 3 psi. Each tank 1/4 full. I have not tried running it with fuel cap open to vent. -8 fuel lines go to a Jegs inline screen filter. I do not know the micron on it. Then each line goes to a ball valve. Then 2 feet of line to a T at the fuel pump. Then -8 line to the fuel inlet.
    Potential problem areas......
    1 no vents other than the caps
    2 small diameter dip tube necked even smaller with fuel fitting screwed inside
    3 fuel filters on suction side have restrictive element
    4 2 feet of fuel line on both sides from shut off ball valve to T at fuel pump. The line that is closed does not stay "charged" with fuel. Excessive length between T and ball valve makes this condition worse.
    Did I miss anything?

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    gn7
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    I have no idea how you fix the dip tubes if they are small, and they are probably too small. But you can always run both open to check that.
    Some caps have vents, although usually too small for a healthy engine. Again, both tanks feeding will help. Clean us then lines!!!!! You caps are venting or it would just quite running. Question is, are they venting enough.
    Get the tiny filter out of the inlet side, all of them. If you want an inlet filter, get a good size filter water seperator like this and eliminate the tee. Run both tanks to this filter and one out. If you like, you can still run one of the Jegs -8 filters on the outlet side.
    Stainless Steel OEM Replacement Filter and Mounting Head - CP Performance
    Make sure the ball valves are large enough!!!
    Make sure the tank feeds to the pump are at least 3/8 and same with the one to the pump.

    TANK DIP TUBES FIRST, OR PLAN ON RUNNING BOTH TANKS TOGETHER!!!



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