Fuel pump 84 vf1000

Is it true I can gravity feed my fuel and remove the fuel pump on the 84 vf1000 ?

 

Yesr its true.....whats wrong with the fuel pump? you sure its bad if its bad?

 

RE fuel pump

I am starting a full restoration on the bike it ran good . The pump was noisy when it was hot but still running well.I will probably replace it but I read on here that the vf750 was ok to remove the pump . One question for you if it runs without it.. does the bike have any fuel starvation or cavitation problems at higher rpm ?

I am sure I will have many questions to ask you motorcycle gurus on this site .
The good thing is I have many hours working on small engines but I like to be sure what I am doing .
Thank you for the quick response if anyone has any AUDI questions I may be able to help as I was a audi tec for twenty two years.

Slippers1000

Drive fast take chances while keeping it black side down .

 

I've got a working pump from my 85 vf700f that I'm willing to sell ya'.

e-mail: mmsv45 AT yahoo.com

 

Others have said this can be done no problem, I think it really depends on the fuel hose routing. However, I tried to gravity feed the '84 1000F I had and it would not run. I had to put in an extra 1000R pump I had laying around. Give it a try and see if it works.

 

I have a 85 vf1000r that t has a very bad leaking fuel pump and can not find one can that bike be gravity feed also?!?!?

 

Well I now know you can not remove the fuel pump on a 85 vf1000r... well you can but it will only run for about 2 mins... then you have to wait about 10 mins for the fuel to be pushed into the carbs....lol.... oh well now I have to find a fuel pump, any ideas?!?!?

 

I'm running an '84 1000F pump in my R. You might also look at mounting an universal electric pump, check the auto stores for something that will fit size wise. Probably would require some fuel hose changes.

 

Yes, you can ditch the fuel pump on all of the first generation VF's, even the VF1000R's. All of my VF's have the fuel pump removed and they run just fine. If you rode one you would never know that the pump is gone, everything works just like it always did - with the exception that a failure mode has been removed.

It's been my experiences that when guys try to convert and have issues it's because there is something else going on with their bikes. A key item to remember is that you cannot run a fuel filter in the system with a gravity feed bike. Honda went to gravity feed on carbureted motorcycles starting in the late 80's and they did not have filters. Run the line from the tank to the carbs as short as possible without putting any bends in it and you should be just fine.

 

Took mine off the day I got it. Runs fine. How much pressure could it possibly need? I could see how it wouldn't work maybe if your lines were a mile long.

 

Well, that's just it: it's doesn't need any pressure. In fact, the stock pump doesn't produce but about 1-2psi (at most) to begin with.

Gravity feed works!

 

Maybe the pump is to counter the added restriction of fuel filters, but the likely hood of these 20 year old bikes to have 100% rust free tanks is a long shot. Granted, the carbs have tiny built in filters, but they should be a last resort...

Like any company, Honda weighs the need vs cost of every part on their products.

Honda design and engineering felt that the pump should be applied.

Personally, I trust Honda engineering over my own... :thumbsup:

 

Agreed. On bikes of mine that have questionable tanks I run a sintered bronze fuel filter. These aer small and only filter out the big chunks. The nice thing about them is there is no flow restriction like with the paper element filters.

Oh good, then you support removing the pumps. Honda did just that on all of their carbureted bikes starting in 1986. Pumps didn't show up again until the advent of ram-air necessitated their use.

 

My motto is "stock rocks".

Automotive and motorcycle companies spend millions of dollars each year on test verification. They don't spend all the $ for fun or to feel good, but to develop a well built product.

I'm just saying that the pump must be there for some reason. I doubt Honda had a bunch of spare pumps just laying around and decided that applying them to a bike was better than throwing them away. Granted the reason may be redicliously extreme (supply fuel during wheelies?), but I'm sure they had their reason.

Jamie, I will say that you know WAY more about these bikes than I ever will, but I think the designers and test engineers knew what they were doing. :smile:

 

They DO, however, spend copious amounts of money just to cover their butts. Can you imagine the specturm of riders, environments, etc they have to design around? I would venture a guess that most of them are far from "typical" riding.

As a Mechanical Engineer I can say this with the utmost certainty - just because it's on there it does not mean the Engineers wanted it!

 

well I rerouted my lines got a new piece to make the shortest run with out any kinks in the hose... but I did keep the fuel filter in kind of don't like the idea of no filter with the age of the bike. It did not work... runs for a little bit. I think it is a paper filter guessing that is the hold up.

 

Yes, the filter is your problem. If you are concerned about stuff getting into the carbs, use a sintered bronze filter for a motocross bike. Those are also gravity feed so the filters do not produce any restriction.

 

It's all I can do to keep my mouth shut.

 

man this is getting good! opcorn: