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Thread: fuel pump questions, Weber conversion

  1. #1

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    fuel pump questions, Weber conversion

    I'm installing my newly gotten 2.6 and it's got a Weber bolted to it, and no fuel pump. I need to figure out what to do.
    I've got a two port 79-80 fuel pump on my old engine. would I need a regulator to run it?
    I could go electric- do I need a regulator with that? a Facet pump should do and is cheap.
    I could get a three port pump from an 81 up truck for about $20- this should have a built in regulator right? what's it set to?
    If i do need a regulator- get a return style one? what model?
    I'm sure these questions have been asked before but I've not found any clear answers.

  2. #2

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    Quote Originally Posted by 2nup350 View Post
    I'm installing my newly gotten 2.6 and it's got a Weber bolted to it, and no fuel pump. I need to figure out what to do.
    I've got a two port 79-80 fuel pump on my old engine. would I need a regulator to run it?
    I could go electric- do I need a regulator with that? a Facet pump should do and is cheap.
    I could get a three port pump from an 81 up truck for about $20- this should have a built in regulator right? what's it set to?
    If i do need a regulator- get a return style one? what model?
    I'm sure these questions have been asked before but I've not found any clear answers.
    UPDATE- thought of another option- the Jeep three port fuel filter has a metered orifice that should maintain 3psi and if installed between the 2 port pump I have and the carb allow me to hook up the return back to the tank much like original. right?

  3. #3

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    You should use an electric fuel pump. Using a regulator on the factory mechanical pump will eventually kill the pump. My recommendation is to use a Carbole 42S electric fuel pump from ebay. They're cheap to buy and are identical to the Mr Gasket 42S fuel pump, only less than half the price (they are the same pump - the model number on the body is the give away) They are a high volume, low pressure pump which is what you need to run the Weber carb. Easy to rig up. You don't necessarily need to remove the mechanical pump but you can make your engine look less cluttered by taking it out and using a block off plate.

  4. #4

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    how about the jeep filter option?

  5. #5

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    Is it a filter or a fuel recirculation cannister? Funnily enough Mitsubishi used a similar thing to split fuel delivery between the main fuel inlet and the accelerator enrichment jet. They were both available in metal and plastic but they did away with them when they changed the design of the mechanical fuel pump to a dual outlet (the metal cans rusted and the plastic ones sometimes cracked or split).

  6. #6

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    The jeep filter on the Mr Gasket 42s pump yielded 2 psi to the carb. I installed the pump at the tank and the filter in the stock area for the original vapor separator- I'll try that too just to see what happens. I've not run the truck yet but will report later. I may make up a restrictor for the return line to get the pressure up if I need it. without the filter, just on the pump I was reading 4.5 lbs. will report further progress next week.

  7. #7



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    with 4.5 at the pump, you won't need a regulator or restrictor - the pressure drop should put it in the 3 - 3.5 range for the Weber.
    Pennyman1
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  8. #8

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    I'm running the Jeep filter. 2psi. it works just fine. the original vapor separator also yielded 2psi. I was getting 4.5 at the carb without a regulator and the engine didn't run differently, so I figure I'm okay plus the pump will be cooler - I'll check the plugs in a week.

  9. #9

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    Question: Why can't you just run the stock mech. pump?

  10. #10

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    Quote Originally Posted by hutch View Post
    Question: Why can't you just run the stock mech. pump?
    Weber carbs do not like "pulses" in the fuel supply. And the stock pump puts out 6 psi- too much for a Weber.

  11. #11

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    Quote Originally Posted by 2nup350 View Post
    Weber carbs do not like "pulses" in the fuel supply. And the stock pump puts out 6 psi- too much for a Weber.
    The Weber will flood from over pressurisation and it will be a pig to run. And then trying to rectify the fuel pressure issue by adding a regulator to the factory mechanical pump will eventually kill the pump. A HVLP (high volume, low pressure) electric fuel pump solves all issues involved with installing a Weber.

  12. #12

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    Been running a factory pump for a few years now with a pressure regulator have not had a problem yet!

  13. #13



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    some 2nd gen mechanical fuel pumps can work with a reg, but I have no idea how to tell which one it is. Something to do with the feedback circuit in the pump.
    Pennyman1
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