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Thread: 66 Austin Healey fuel pump replaced

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  1. #21
    Luke Skywalker vette's Avatar
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    Re: 66 Austin Healey fuel pump replaced

    i agree with you, the concern is there. But as you have said the experiences seem to point to the fact that it is not an issue.
    About TV Shows-
    "...you really can't restore a car in 10 days. I don't want to watch a race where people have to restore it in a week. It's not going to drive, and those cars never work. In real life, it takes years to get it right. " Jay Leno.

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    Yoda steveg's Avatar
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    Re: 66 Austin Healey fuel pump replaced

    Quote Originally Posted by Bob_Spidell View Post
    ...I heard somewhere, possibly Anderson/Moment that the reason for the switch from port to starboard were due to heat issues near the exhaust, but I can't prove it. I haven't heard of a single Healey catching fire because of a fuel pump leak but, I also don't have any heating issues with the BN2 that I can attribute to the muffler cooking the pump.
    I think it was about vapor locking not fire hazard.
    Steve Gerow
    Altadena, CA, USA
    Maker of most complete Big Healey rear disc kit
    Check out my galleries:
    http://www.pbase.com/stevegerow


  3. #23
    Obi Wan RAC68's Avatar
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    Re: 66 Austin Healey fuel pump replaced

    Hi All,

    I have always stood in ah at the ingenuity so many have extended to the implementation of our fuel pumping system. As many of you know, I still have a points SU pump in my BJ8 Phase 1 but back in the mid 1980s, was convinced by a friend to replaced the Square bodied SU with the newer round-bodied unit used by the phase 2. Looking back, there was no necessity to do this as the pump, as with its replacement, could have been easily modified to last well past today. The modifications I have executed through the years were quite simple and included:

    1) Conversion to neg. ground (no physical change needed for the SU pumps I had/have)

    2) Extended point life indefinitely by addition of a Transient-Voltage Suppression diode (TVS @ $1.50). This diode is placed across the points to limit voltage passing across the points to a max of 21 Volts. Without this diode, the effects of the pump's coil could raise voltage passing across the points to multi-hundreds of volts and could cause premature points failure. with the TVS, voltage is limited to 21 volts (high enough to clean points but low enough to be below burn potential) with all access voltage gated to ground.

    3) Fuel pump Inertia Switch to shut off fuel flow in case of an accident (cuts power after heavy blow or car turnover).

    Due to these additions, my points pump has worked well and with little consideration for the past years and is expected to continue into the future. However, keep in mind that I have focused on the electrical longevity of the pump and their are still other components (i.e. diaphragm etc.) that still warrant aging concerns. Yes, 2 pumps can be better if one fails but also brings added complexity. New solid state pump replacements can also reduce concerns but that has not proved to be a securing move in the past for when they fail, unlike points, there really dead.

    Well, just my thoughts,
    Ray(64BJ8P1)

  4. #24
    Luke Skywalker vette's Avatar
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    Re: 66 Austin Healey fuel pump replaced

    Quote Originally Posted by RAC68 View Post
    New solid state pump replacements can also reduce concerns but that has not proved to be a securing move in the past for when they fail, unlike points, there really dead. Well, just my thoughts, Ray(64BJ8P1)
    Hi Oh Great Obi Wan (RAY). But, to reference your quote, that's why I have two.
    About TV Shows-
    "...you really can't restore a car in 10 days. I don't want to watch a race where people have to restore it in a week. It's not going to drive, and those cars never work. In real life, it takes years to get it right. " Jay Leno.

  5. #25
    Obi Wan RAC68's Avatar
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    Re: 66 Austin Healey fuel pump replaced

    Hi Vette,

    I can understand having 2 pumps for security and, in the boot, I carry a pump head section as a replacement if my pump does go bad. As I see it, it takes a few minutes to pull the right wheel and unscrew the head from the pump and replace it with another as the head, containing the trigger, is the most prone to failure. The head I carry is the Optical Trigger a few friends and I created when everyone was experiencing a rash of SU solid state head failures and before I found the Transient-voltage suppression diode @ $1.50. Although the Optical Trigger for the SU pump did perform very well, when considering the life and performance extended to points by adding a TVS, economically it didn't make sense to continue the effort and now it is carried as my backup. It was a good example for me to learn how to make a printed circuit board and with learning errors and components, the project cost less then $25 if I remember correctly.

    PCB Pump Side View.jpgPCB Pump Top View.jpg

    All in all, the Optical trigger is reliable and self adjusting but, as with any solid state device, if it fails it is dead. With points, I have a good chance of getting it going and arrive at my destination.

    Keep in mind that if you have 2 pumps in series (main and backup), any electrical issue causing your main to fail can also affect your backup.

    Just my thoughts,
    Ray(64BJ8P1)

  6. #26
    Yoda John Turney's Avatar
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    Re: 66 Austin Healey fuel pump replaced

    Quote Originally Posted by RAC68 View Post
    .... Keep in mind that if you have 2 pumps in series (main and backup), any electrical issue causing your main to fail can also affect your backup.

    Just my thoughts,
    Ray(64BJ8P1)
    I can understand this if you mean "in series" electrically, but they can't be wired in series and work. If plumbed in series, either pump can pump through the other.
    John, BN4

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    Re: 66 Austin Healey fuel pump replaced

    Update problem,
    Sorry

  8. #28
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    Re: 66 Austin Healey fuel pump replaced

    John,

    Sorry I wasn't as clear as I thought but you did presume correctly. The pumps are in searies and I was thinking that the electrical connections would be centered from a single feed before the intrusion of a selector switch. Circuit power issues would be sunted to the selected pump and if the issue caused the pump to fail then their is a good possibility that the selection of the backup would expose the backup to the electrical issue as well.

    Maybe it would be best if each pump was wired to a separate circuit and each controlled with an on/off switched.

    Again, you were correct and I was not as clear in presenting my thoughts as I thought.

  9. #29
    Yoda steveg's Avatar
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    Re: 66 Austin Healey fuel pump replaced

    Quote Originally Posted by RAC68 View Post
    ...Maybe it would be best if each pump was wired to a separate circuit and each controlled with an on/off switched.
    ...
    Ray,
    I had both my pumps "fail" in that the ground wires were attached to the same bolt, which became loose. My O2 meters told me both carbs were starving. I then ran the grounds to separate bolts.

    If one ran two circuits to the pumps, could you use a DPDT switch instead of two separate switches?
    Steve Gerow
    Altadena, CA, USA
    Maker of most complete Big Healey rear disc kit
    Check out my galleries:
    http://www.pbase.com/stevegerow


  10. #30
    Jedi Warrior red57's Avatar
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    Re: 66 Austin Healey fuel pump replaced

    I have mine wired as two separate circuits. I'm pulling fused power (with the key on) from the fuse panel to an on/off/on switch under the dash, then two inline fuses and separate wires to the pumps. So, if one pump dies or the fuse blows or the wire gets pinched, I flick the switch and not only a backup pump but a backup fuse and wire too.

    I got overly concerned about shorting the wires down the frame because several years ago on a dirt road in the Yaak Valley in Montana on our way to Calgary for a vintage race, I drove over some exposed tree roots that one of the wire loom clips hooked on and rotated it enough to cut through the wire loom and into the fuel pump wire. Smoke everywhere. A that time I still had a stock unfused fuel pump circuit and the whole bundle of wires burned to a crisp before I realized what was happening and the result was replacing the entire rear wire harness at the edge of the dirt road (my buddy went exploring and found a fellow nearby with a dead junker in the yard who allowed him to cut out some sections of it's wire harness to make my repair)

    Dave

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