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Thread: SU fuel pump

Discuss the Austin Healey Sprite and the MG Midget. Two different but similar cars sometimes referred to collectively as the Spridget.

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    Darth Vader Rut's Avatar
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    SU fuel pump

    After wiring up my rebuilt (by me) SU fuel pump, AUF305 from a 73 Midget it refuses to run. I tested it on the battery before installation after I rebuilt it and it worked without hesitation. Everything looks good, but no joy...should I send it off for a rebuild or buy a new solid state SU? If I send it off, who should I send it to?
    Thanks, Rut
    Rut, '60 Bugeye, '70 MGB, '62 TR4, '66 TR4a IRS, '67 TR4a IRS, '68 TR4a IRS, '72 TR6

    When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life. John Lennon


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    Jedi Knight smaceng's Avatar
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    Re: SU fuel pump

    Are you sure that it is grounded properly?
    Scott in CA
    1973 TR6

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    Darth Vader Rut's Avatar
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    Re: SU fuel pump

    Scott,
    I removed it from the car and connected it directly to the battery, no joy.
    Rut
    Rut, '60 Bugeye, '70 MGB, '62 TR4, '66 TR4a IRS, '67 TR4a IRS, '68 TR4a IRS, '72 TR6

    When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life. John Lennon


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    Great Pumpkin JPSmit's Avatar
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    Re: SU fuel pump

    Quote Originally Posted by Rut View Post
    After wiring up my rebuilt (by me) SU fuel pump, AUF305 from a 73 Midget it refuses to run. I tested it on the battery before installation after I rebuilt it and it worked without hesitation. Everything looks good, but no joy...should I send it off for a rebuild or buy a new solid state SU? If I send it off, who should I send it to?
    Thanks, Rut
    If it worked before, it should work again - walk away from it tonight - go back tomorrow and methodically work your way through.
    John-Peter Smit
    1976 MG Midget
    1969 Vauxhall Viva GT
    1958 Fiat Multipla (Barn art)

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    Re: SU fuel pump

    Perhaps a love tap with a mallet ... just for good measure.

    Good luck!
    ************************
    Nate B.
    1966 Austin-Healey 3000 MK III (BJ8)
    1972 MGB-GT

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    Yoda
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    Re: SU fuel pump

    Quote Originally Posted by AN6-TX View Post
    Perhaps a love tap with a mallet ... just for good measure.

    Good luck!
    Ah, yes, remember many happy love taps to get the old SU going! A friend carried a short piece of 2X4 just for the "routine". For me in my MGB a good solid whack with my fist on the bulk head would do the trick.

    Very sensitive to a little corrosion on the points, Rut. Has the pump been sitting for a while?
    65,66 Midget
    57 Berkeley, MGA
    Working on quality rather than quantity

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    Jedi Warrior BlueMax's Avatar
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    Re: SU fuel pump

    Had my fill of SU pumps, no more for me!! I running a Facet pump, it has more volume to supply my hungry 1380...

    P1030765.jpg

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    Darth Vader Rut's Avatar
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    Re: SU fuel pump

    Quote Originally Posted by nomad View Post
    Ah, yes, remember many happy love taps to get the old SU going! A friend carried a short piece of 2X4 just for the "routine". For me in my MGB a good solid whack with my fist on the bulk head would do the trick.

    Very sensitive to a little corrosion on the points, Rut. Has the pump been sitting for a while?
    The pump is corrosion free and looks like it did after I rebuilt it about a year ago. I'll take it apart and see what's going on, but I really want a trouble free SU pump and if all else fails I'll send it off or buy a new electronic ($$$$ shudder) one.
    Rut
    Rut, '60 Bugeye, '70 MGB, '62 TR4, '66 TR4a IRS, '67 TR4a IRS, '68 TR4a IRS, '72 TR6

    When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life. John Lennon


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    Yoda
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    Re: SU fuel pump

    I had the electronic SU on my MGA and it ran flawlessly. I didn't put the 70K miles I had on my MGB on it though. I always liked the way a SU would re-assuredly pump up pressure then stop. Told you if you had a leak or stuck float needle's or a vapor lock. Also told you when it needed a whack! I replaced mine on the B with a Bendix that is now owned by Facet. It is the Facet gold pump that Facet claims is their most reliable. That Bendix is still running after close to 50 years and way over a hundred thousand miles. A friend owns the car and that pump has been trouble free.

    Kurt
    65,66 Midget
    57 Berkeley, MGA
    Working on quality rather than quantity

  10. #10
    Darth Vader Rut's Avatar
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    Re: SU fuel pump

    I opened up the pump this morning and everything looks new...connected it to the battery and it ran like a champ. The points are clean, but I'm considering the electronic conversion. Anyone have a good source stateside?
    Thanks, Rut
    Rut, '60 Bugeye, '70 MGB, '62 TR4, '66 TR4a IRS, '67 TR4a IRS, '68 TR4a IRS, '72 TR6

    When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life. John Lennon


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    Darth Vader Bayless's Avatar
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    Re: SU fuel pump

    We had a member here at BCF who would do that conversion but I don't remember who it was. Basil probably will know.
    Was Man nicht im Kopf hat muss Man in den Beinen haben
    '48 Ford Prefect
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    Senior Member 1974MGMidget's Avatar
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    Re: SU fuel pump

    Yes, Dave DuBois does a beautiful job rebuilding SU fuel pumps. See:https://userwebs.donobi.net/sufuelpumps/

  13. #13
    Darth Vader Rut's Avatar
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    Re: SU fuel pump

    Thanks guys, I'm looking for the points conversion kit since everything else has been rebuilt. If it was a pump in bad condition I would send it to Dave for a full conversion and rebuild, but hindsight being what it is...
    Rut
    Rut, '60 Bugeye, '70 MGB, '62 TR4, '66 TR4a IRS, '67 TR4a IRS, '68 TR4a IRS, '72 TR6

    When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life. John Lennon


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    Re: SU fuel pump

    I bought this SU new and it developed a leak shortly after it was in use. That was a year and a half ago. Since I had a supposedly reliable Facet pump I procrastinated doing anything with the SU and relied on the Facet. Big mistake, it was only good for about 6,000 miles. So I had a car with two bad pumps. Turned out to be a simple fix for the SU and the trash bin for the Facet which is now replaced. And now have the back-up system from Dave Dubois back in operation which is what I started with. https://userwebs.donobi.net/sufuelpu..._Fuel_Pump.pdf
    Now I can run until one quits and switch to the other, then drive until the back-up pump quits and be stranded with two pumps that no longer work. Procrastination!

    IMG_1103.JPG
    Tom
    76 TR6
    74 Midget
    www.madbrits.org/
    www.mg3club.org/

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