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fuel flowing from top tank to bottom extremely slow

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Re: fuel flowing from top tank to bottom extremely slow

PostAuthor: mark75 » Thu Aug 09, 2018 4:31 pm

I re-read your post, and I wonder if there is a possibility that the fuel hose between the main and sub-tank has a "kink" or is pinched?

I've had no experience with the 400, but my 1100 would fill the sub-tank fairly rapidly [only tad slower than main was filled].

If it takes more than ~1/2 a minute to go from main to sub- there is something amiss with the line[s]---
if new line, then it's restricted somehow,
if unrestricted, then an outlet / inlet or vent to tank's clogged.

perhaps run a guitar-string or steel fishing leader-wire thru the vent pipes to ensure they is patent.

normal fuel tank is vented through the fuel cap during normal operation, and yours doesn't sound like the issue is there, but between tanks.
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Re: fuel flowing from top tank to bottom extremely slow

PostAuthor: mark75 » Thu Aug 09, 2018 4:43 pm

sinoda wrote:
bstig60 wrote:Should be very quickly. Do you have a restriction in the fuel line from the auxiliary to the main tank?



yes i do have a fuel filter just before the main tank cause the top tank its rusty,
i had to stop 3 times at the gas station near my house to fill it, and even after that im not sure its 100% full.



perhaps the filter should be before the carbs and not between the tanks??

or a sealer-coat could be in order for the 'rusty' tank??

sounds to me like the filter could be the "bottle-neck". :con:
"Over the Mountains of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride" ... E.A. Poe

'13 - FXDC Super Glide Custom
'82 - XV750

Time flies whether you're having fun __ :bike: ... or not ... :fan: ---
and --- Any day above ground is a good day.
so Laissez les bon temps roulez ... just roll safely

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Re: fuel flowing from top tank to bottom extremely slow

PostAuthor: Jake » Thu Aug 09, 2018 4:50 pm

This needs repeated, clean the tank !

Then get rid of the filter between them !
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Re: fuel flowing from top tank to bottom extremely slow

PostAuthor: sinoda » Thu Aug 09, 2018 5:05 pm

the bottom tank has been coated with epoxy sealer at a professional .
i thought id skip the top tank and just put a large fuel filter there, fuel flows freely
i do have an other filter just before the pump .

https://imgur.com/gallery/H91sMaJ
1 is from top tank to bottom tank to collect rust flakes,
2 is also from top tank goes to bottom , but because its higher on the the tank no rust comes in the filter.
3 goes from bottom tank to fuel pump to prevent pump from clogging .

As you can see the flow from they "vent" hose is great

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Re: fuel flowing from top tank to bottom extremely slow

PostAuthor: Jake » Thu Aug 09, 2018 5:31 pm

Take the filter off of the vent line.

It’s not needed and you are restricting air flow needed if even a little bit of fuel gets in that filter and it looks like there is.
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Re: fuel flowing from top tank to bottom extremely slow

PostAuthor: sinoda » Sat Aug 11, 2018 8:37 am

Jake wrote:Take the filter off of the vent line.

It’s not needed and you are restricting air flow needed if even a little bit of fuel gets in that filter and it looks like there is.

gonna take it off next time i go to refill and see if that helps

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Re: fuel flowing from top tank to bottom extremely slow

PostAuthor: mark75 » Sat Aug 11, 2018 5:28 pm

this might help narrow-down the year of your bike ---> http://bikeswiki.com/Yamaha_XV400_Virago
if it is a Gen-II. Asian market from '87 to '94, then XVS 400 'Star'.
if Gen-I then probly '83 or '84?

the 400 was pretty much morphed into & sold as 535 in USA :con:

re-reading previous posts, something occurred to me, you said the tank has been "sealed", it's possible the outlet [or vent] got accidentally clogged a little bit with sealer.
"Over the Mountains of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride" ... E.A. Poe

'13 - FXDC Super Glide Custom
'82 - XV750

Time flies whether you're having fun __ :bike: ... or not ... :fan: ---
and --- Any day above ground is a good day.
so Laissez les bon temps roulez ... just roll safely

"I hear and I forget, I see and I remember, I do and I understand." ... Confucius*

If you don't read the news you are not informed.
If you read the news you are misinformed.
... Mark Twain

New Members Note- The site will allow full access (U/L, D/L, PM, etc) after your 5th post.

TIP: search the Knowledge Base Board Nav., Tech Articles, Tips, and Links for tricks, and Solutions...
the search may seem or feel ponderous, but it's worth the effort.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*The views, opinions, and experiences expressed in this post are mine and may not necessarily represent views and opinions of other VTF members, so feel free to agree, disagree, or ignore them.*
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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Re: fuel flowing from top tank to bottom extremely slow

PostAuthor: sinoda » Mon Sep 24, 2018 7:19 am

well that took a while :/
i removed that fuel filter and it still takes a while for the fuel to flow down.This feeding system to bottom tank is problematic, i think thats how it works .. i cant figure anything else

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Re: fuel flowing from top tank to bottom extremely slow

PostAuthor: bstig60 » Mon Sep 24, 2018 9:20 am

Here is the part number for the hose; 3JB-24316-00-00 ; it is at lease12mm ID, most likely 14mm. Fuel should flow nearly as fast as you can put it in the tank with the fuel hose without spilling from the upper tank to the lower tank unless you have some kind of restriction, It may be in the hose.. I would suggest pulling the upper tank, cleaning it of any loose debris and making sure the hose to the lower tank is free including the vent hose....
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