Blower Reference lines

the issue i have is the reference lines fill up quickly with fuel.
im not sure if it has any affect on the powervalve.
ie damages it, or causes it to not get reading.

i assume (ass out of you and me) that it wont matter it will still see signal.

can anyone confirm or deny these accusations?

Are you asking a question about the blower, carb. or fuel filters?

A picture would be worth a 1000 words.

I would try to route the line so it drains back to the manifold and no I would not worry about it too much at this point. Do you have your carb setup like this one in my link?

I know you don't want to hear this but, IMO carbs don't work so well on blowers. You should go injection if your gonna use a blower and blow the guys away who are trying to use carbs.

Checkout this link to get familer with what he is asking about.
LINK

I don't think there should be any fuel in the vac,boost side of the power valve.

Since that line is under boost sometimes it stands to reason that fuel is going find it's way into that line. All you can do is route it so it can drain when the boost goes away. Part of the reason carbs are not the best for blowers.

its a factory referenced carb.
the lines i used are clear so they are fuel milky inside
seems to be running fine
and yes they would see fuel since its manifold pressure/vacc under the carb/blower
so the fuel mixture goes inside.

no picture yet i can take one (never had to take one of a boring reference line before)

next question is diameter of the lines really matter?

I just have never had fuel in my gauge line for boost,vacuum but that is a 1/8 nylon.I would say you have a leak at some point letting it migrate up the line.

Your leak may be very small but if you put a hand vacuum pump on the line going to the carb you can test it with the car not running.

i dont have any leaks...
i pull about 15lbs vacuum at idle under the blower.
and hit 12lbs boost. the reference line is under the blower.
where air and fuel are. usually people use black lines.
i just had clear so wanted to make sure.

my line is 1/4 clear hose.

The 1/4" will be fine!Air moves fast,Just watch for heat related effect like getting too soft or bending and keeping that form.

form seems good.
here is the pix

cant make it all drain back.
its not really a solid more like a foam

So those are in the base plate? I just did a pair of 850's for a 588 BB Chevy in a boat and they referenced from the ported hole in the metering blocks w/hard line and no issues w/fuel that I could see and he said they flat out flew............

no they go into the front of each carb just above the mounting flange
so far im not happy with these demons nothing but headaches.
but i had bought them back in 2008.
and didn't use them until a few months ago.

it didnt happen over night it just kept getting milkier and milkier
most of it from flooding during tuning stage. (did more last night)
they seem to be working as the car pulls stupidly hard now.
ill replace them with fresh lines and see if they start building up again.
if it does ill simply go smaller diameter and coloured. (canadian u eh?)

You can get rid of that Y fitting on the passenger side of the carbs and run 1 line to the tee on the other side.The carbs are sucking oil from the intake that may be from the blower front where you need to relieve the pressure or it can push oil.

I don't think you have boost referenced pv carbs like that but I would have to see a vac port diagram.

I can fix the carbs for ya and you can see LOTS of vids and pics on FB under Dominic Thumper and have also done several for peeps on here...........

if that tubing goes to the power valve you should not be able to blow in it freely

these are the carbs
http://www.speedwaymotors.com/Barry-Grant-Demon-Inline-Twin-Blower-Supercharger-Carbs,5849.html
bought them before barry grant went bankrupt
they are the 725cfm edition blower reference carbs
part number 91012066

there is no T on the other side.

ok I see how you have that plumbed but there should not be any fuel or oil coming up the line,imo

from the q,a on bg link[Open Reply - John
The Barry Grant Demon inline blower carbs number 91012062 for 525cfm, 91012064 for 625cfm, and 91012066 for 725 cfm carburetors are designed strictly for blower or supercharger applications where boost is provided. The power valves and internal components are changed and become load sensitive for smooth operation. The vacuum secondaries are desired for street use and obtain the vacuum at the base of the carburetor. A blown or supercharged engine does not develop vacuum at the intake as a normally aspirated engine and therefore must draw port vacuum at the base of the carburetor.]I think you are just connected to the vac for the sec diaphram[why it sucks fuel,oil]The boos ref pv is at another port or metering plate.

there is no other ports that are open aside from these two
the vacuum secondaries get theirs from inside of the carb.

Please put a second spring on your throttle. For your safety and others.

Good luck with it, looks great!!

the carbs actually fall back to nutreal on their own
the peddle has one as well i like the feel. but sure.
the dash has ign shutoff by switch >.<
its getting there
need dash plate,
tackle oil leaks
dual 3 'exhaust (prob xpipe two glasspacks and my mufflers dumped at axle)
afr sensor
dyno time
jetting
hood work
decals
some interior
shorter rear shocks (theres 1 inch before bottom)
for whatever reason i bought shocks that were stupidly too long
probably for oem mounting locations.

eye candy is here and here. sadly the memory card lost the engine and transmission buildups.

https://imgur.com/a/Z8ZsQ
https://imgur.com/a/OHeK8
https://imgur.com/a/iZPDI