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Thread: pict 34 3 and other vw questions in one thread

  1. #11
    Old Redneck Motorhead
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    Good news then.

    And a happy holidays to you also.

    Things are also slow with me and any personal projects......just not into anything right now.

    I do not like the idea of shimming the pump or shortening the rod. I would think either would also reduce output volume....and I dont think that would be good to do. But then I have zero actual experience with that situation.

    I do think a decent regulator is the correct way to go. Maybe one day you will have to go flat out up a massive long uphill mountain pass kicking the rpm up there in third gear sucking up the fuel.

  2. #12
    20+ Posts the13bats's Avatar
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    I am very ADD OCD and have nervious issues like ptsd,

    I have a lot of hobby interest and after about sept between hoildays and shows ( i was in nightclub music, biz and still do guest shows ) i get swamped exhausted, but now after all that is behind me i get to putz with projects.

    In my other car hobby ( c3 corvettes ) there is an odd mindset with some if its posted on that one forum doesnt matter who posted it or why it still must be gospel,

    That doesnt float for me and my OCD no matter what im messing with i do research from many sources i come to my own conclusions and theories based on what i then believe.

    I like many acvw owners are running an electric fuel pump, so the only reason i mentioned mech pumps was because the problem exists for both camps,

    I hear you, the excessive fuel pressure fix for acvws of adding gaskets or cutting pushrods sounded down right hack job to me normally ( im my gearhead world ) stock mech fuel pumps are self regulating.

    So sure saying add gaskets or shorten the pushrod to lower pressure sounds odd at the very least,

    To add to that i even read that when installing a stock mech pump if the push rod measures too short mill off a little from the base of the pump.

    There are at least two stock fuel pumps, short for alternator engines long for generator engines and it would appear variants to them so some would like to blame too much fuel pressure 100% on mixed up pushrods,

    Not so fast, when we toss aftermarket into the mix, both pumps or rebuild kits, i see some getting pressure reading way high over 20psi in some cases, and no, gasket or pushrod mods wont fix that,

    The problem there is the aftermarket springs have too much tention, clever guys go back and try their orginal springs and all is well.

    The ones fixing the pressure problem adding gaskets or modding the pushrods are getting to the desired 2.8psi by adding say one ir two gaskets or cutting one mm from rod, this is not going to be a fix for a stock aftermarket pump with way too high spring tention, but rather how vw fine tuned it.

    http://1967beetle.com/fuel-pressure/

    Thats a link to a guy who words it far better than i can.

    For me its moot, i seldom run mech fuel pumps this was a case where i was not seeing the forrest for the trees, i have a pump that puts out 7 to 10 psi to a carb that gets upset at anything over about 3.5psi

    i can see this being a real pita for a guy who replaces his old mech pump with a new mech pump and now his vehicle wont run or run correctly.

    Not too many great hills in florida but i can assure you that 2.8psi will never starve my stock 50hp vw engine

    Now my punched out 454 with silly cam, yeah, its rather thirsty.

    Sorry that is such a long post i was in a hurry and couldnt make it any shorter.
    "We are the music makers and we are the dreamers of the dreams"

  3. #13
    400+ Posts LarryA's Avatar
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    could this be as simple as... carb kit maker just increases needle/seat inlet diameter/area, without giving the float more area to counteract increased forces on the needle? Maybe aftermarket floats are undersized or made of less bouyant material. just a thought...

  4. #14
    20+ Posts the13bats's Avatar
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    Larry,

    Since its a fact in my mind aftermarket stock replacement mech fuel pumps and rebuild kits do sometimes have too much spring tention and too high of pressure aftermarket carb kits might be junk ( imho ) too, i wouldnt be shocked the acvw aftermarket is overflowing with garbage.

    I will only run real solex carbs and parts, no bocar or empi clones, they lack quality control, very hit or miss, one guy might love his empi the next 5 never could make them idle correctly.

    Be all that as it may, the german manual says "about" 2.8psi is right, so too much pressure has to be corrected.
    "We are the music makers and we are the dreamers of the dreams"

  5. #15
    Old Redneck Motorhead
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    I would think a lot of it has to do with the physical size of the float.

    Small float is small seating pressure.

    Large float being able to put more pressure on the seat and close off more psi.

    Well.....all that said.....I run 47psi......and nothing remotely stock.

    So bottom line is you gotta check these details and do the research on the equipment you want to use.

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