Fuel pump absolutely necessary on a 1985 VF700?

Discussion in '1st & 2nd Generation 1983-1989' started by FasYankee, Mar 17, 2014.

  1. Markvfr800

    Markvfr800 New Member

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    yes, to hold a filter!
     
  2. JamieDaugherty

    JamieDaugherty New Member

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    Staying grounded in facts is really helpful here. It is unfortunate those pesky laws of physics disagree with opinions.

    Honda's Engineers do not always get what they want - just look at the top end oiling system of the first generations. There are political, regulatory, waranty, and many other reasons designs are finalized in the manner they are. I've personally experienced this in my Engineering career while working in industry.
     
  3. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    Are you suggesting republicans, the EPA, or the desire to warranty what you consider a useless part were motivation for the pump? All I'm asking is for some kind if plausible hypothesis.
     
  4. Jeff_n_Franklin_Tn

    Jeff_n_Franklin_Tn New Member

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    Who knows...maybe Honda was experimenting? Maybe Honda thought that having a pump would be a sure way of not having fuel starvation issues? Maybe Honda thought it would boost sales? Auto manufacturers don't put all those bells and whistles in their cars just because they have the technology or think it's necessary to do it. They put them in there to get you to buy the car.
    I'm sorry I've irritated you with this....and now I'm sorry I drug Jamie into it. I don't even own a 1st gen 750F but if it works for others and has worked for many....I'd be looking into it.
    Just sayin.
    Have a nice day.
     
  5. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    People don't have to be irritated and angry to disagree and debate. In fact, the debate is usually better when people don't get butt hurt.
     
  6. Jeff_n_Franklin_Tn

    Jeff_n_Franklin_Tn New Member

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    One more thing I just thought of....Going back to the engineers, Why would Honda design a tank/petcock that will only work with a pump. Seems to me it would cost Honda even more money to go that route.
     
  7. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    Sounds like you're coming around to my way of thinking that the pump was there for a reason
     
  8. Badbilly

    Badbilly Official VFRWorld Troll Of The Year!

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    The dude explaining the gravitational forces on a column of liquid is Apu Nahasapeemapetilon.

    Apu hates going up and down those damned mountains with less than 2/3 of a tank of gas because the height of the column changes.

    I think he now lives somewhere West of Omaha.
     
  9. Jeff_n_Franklin_Tn

    Jeff_n_Franklin_Tn New Member

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    No...I'm not. I never implied a pump wasn't "necessary". Merely pointing out that people have been able to make it work without a pump without issue. If it will work without a pump, why buy one? If folks would rather want to install an after market pump, nothing wrong with that.
     
  10. 4a15

    4a15 New Member

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    Does not need pump is my vote. I believe it is true that honda would not install extra parts to save money. They would also not spend money to design new parts if their warehouses are full of parts that already do the job. The part i am talking about is an automatic fuel shut off... in event of a crash, or the engine dying. You can run a cheap aftermarket electric pump, but after a crash, the pump will most likely continue to run. With the bike on its side the carb floats wont stop the fuel flow = greater chanch of fire. Factory pump shuts off and restricts flow if engine is off.

    Sure running dirrect line would allow fuel to flow freely... but not as fast as pumping it out!


    The bikes in which did away with the pump.. dont they use the vacuum controlled petcock?
     
  11. flash50080

    flash50080 New Member

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    cbr600 fuel pump should work it all looks the same and they are still available with shut off for around 50$ may need to change the connector end but not sure. you can also get the point switch if thats whats bad on your pump.
     
  12. GreyVF750F

    GreyVF750F Member

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    Here's what an old Honda engineer has written about the so call oil starvation people wanted to believe about 1st gens.

    http://www.motorcycleproject.com/motorcycle/text/v4_cams_what.html Plus check out Mikes main site. Think he knows Honda's?

    As far as the pump the ones I've played with wouldn't work correctly without a pump. Tanks and screens were fine. Some say they do work without pumps. What's the difference between to two camps as far as bikes went. Stuff I had was stock fuel line size. Other may be larger?

    See what you did Jeff!! Wait till the SGT you get yours. Assassins a wait.
     
  13. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    Gray went and done it now
     
  14. squirrelman

    squirrelman Member

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    The exact same pump was used on dozens of bikes from Yamaha, Kawasaki, and dozens of Honda models from '85 to '97 so try a salvage yard.

    Pictures riteaid 079.jpg
     

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  15. FasYankee

    FasYankee New Member

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    Ahhh.....thanks? Lol, seriously guys I had no idea that this would be such a hotly debated topic....

    Sorry for being vague on the question, but there's nothing wrong with the pump on my bike, it runs the tank dry with the pump.....um...I live at sea level if that makes a difference?

    Anywho, the issue with the pump is that I'm building this bike, as in the only thing that vaguely resembles a 1985 interceptor is the frame & the motor, and actually the frame has been modified slightly. The pump, starter solenoid, battery, reg/rectifier, a relay or two are usually mounted behind the side panels behind the shock/under the seat. Well, that area contains nothing now. Everything has been relocated. All the frame tabs have been ground off and the wiring harness has been reorganized to compensate for the movement of aforementioned items. I can use the stock pump but d rather not. Aesthetically it doesn't complement my design. I know that I could get another pump to replace it but none of the 3-5 psi pumps I've seen are small enough to make a difference. I guess what I can do is just run it without and take the chance of having to add it later or run it and figure out another possible mounting location. Actually I would probably just get one of this inline ones like one of you pictured, that would work slightly better but still not ideal.

    I appreciate all of your responses! You're quite a passionate bunch (much like myself). When I finish with the build, shouldn't be long now, I got hurt at work and am off for who knows when, I'll be sure to write a thread from start to finish. I've been photographing every step I can so I've got tons of pics!

    Thanks again for all your input guys!!!
     
  16. TOE CUTTER

    TOE CUTTER Mullet Man

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    Toss a real grenade in here next time and bring your politics. :kaboom:
     
  17. BWeiss

    BWeiss Johnny Partseed

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    Winter is almost over, but people are still snowed in. The lack of motorbike riding is beginning to settle in, all the while just looking at it sitting in the garage. Sitting on a bike in the garage and making vroom vroom sounds isn't enough to hold most of us over. Much like cabin fever, only worse. In a month or two, you'll be able to call everyone's mother a whore and no one will bat an eyelash cuz they'll all be on their bikes and/or in better moods. These "controversial" topics are best left to summer when everyone is in a better mood.

    Notice us California guys are pretty laid back most of the year since riding season never really ends.
     
  18. GreyVF750F

    GreyVF750F Member

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    That and LOOKING at Toe Cutters avatar all winter. @@#$%^#^&**&%#$#@$^&^..................................
     
  19. TOE CUTTER

    TOE CUTTER Mullet Man

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    WHAT?!?!?!?!?!?!? :photo:
     
  20. crustyrider

    crustyrider New Member

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    yeah.. tried gravity feed on mine... it only worked till it got to the bottom halfish of the tank... and yes I had good flow .... i have the aftermarket fuel pump on it now
     
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