LUVTruck.com

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'78 1.8L 4-speed Fleetside

The only thing more beautiful than a sunset is a sunrise.

i got an old very used(of questionable origin) weber that im not even sure if it works yet, but i have the same issue, it may be in then throttle lever where the cable ataches to the carb, on mine there is(was) a spring that was liek a recoil that brought the throttle back closed aftrer you let of the gas pedal, what i did was removed the spring thats part of the linkage and use a couple extra ones that i have for both side of the throttle linkage, if your mechanical at all then you can get a little creative and figure it out...

-Dustin

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My LUV - R.I.P. 1979-2009, you will not be forgotten...

Like Ron said, this is not correct. The red hose is not just a vent, as the fuel in the tank loses volume or needs to displace air it does it through that hose. The way you have it routed it will be picking up oil and some pressure. I dont care about that "pressure takes the path of least resistance" thing, that hose is supposed to be free venting for a reason. Oil will get into all of your vapor recovery hoses and cause them to rot out at a much faster rate.

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Certified pilots, looking down on people since 1903.

Lmao! So what's the score now?

Hmmm...fulla - 0, luvtruck.com old timers - ???

I've been real busy and I lost track of the count...

J/K..as usual.

No no thats not how it works at all. See the presure from the valve cover will in turn preasurize the gas tank. This will then make gas shoot from the carb netting you more horse power...

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1980 LUV 4x4, going under re-construction...

I'm no engineer, nor a luvtruck old timer, but this is really hard for me to understand, as I was thinking about hooking mine up similarly.

It makes more sence to me that if pressure was building up, it would escape through the air filter instead of by filling the fuel tank with pressure. The fact that they both end up in the air filter which is nearly the same way it was setup with the stock filter, affirms my belief, but I also see how it could pressureize the fuel tank, if an easy enough path is not provided for air to escape the fuel tank. I guess I'll consult an enginner major at my university for their analysis.

I'll let you know what their answer when I get it.

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-1979 LUV 4x4

It is pretty easy to understand. The air from the valve cover and the air from the vapor recovery system are stand alone systems on a stock truck. One reason is one carries oil vapor and one carries fuel vapor. One is usually under pressure and one is not. As the fuel tank burns gas it will pull fresh air through the hose, if the vent line from the valve cover is pressureized guess what will end up in the tank Mr. I wanna go ask a enginner who has never messed with a LUV vapor recovery system.

Do what you want, I really dont care, I have 3 LUVs running fine.

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Certified pilots, looking down on people since 1903.

I sent an email to 4 engineers. One owned a LUV, and another one helps me keep mine running. The other two are just plain geniouses engineers (we've all met thoes types ).

I see your point, but I also see fulla's point. Thats why I'm seeking the advice of some of my friends more qualified to answer this question then myself.

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-1979 LUV 4x4

Oh for cryin' out loud...just how many times do us guys that have been on this site and have been tinkering around on these old trucks for a long time have to repeat ourselves? It's a pretty simple concept that you don't have to work for NASA to understand. And if some of you new guys would just look at the info section on the main page, do a search before you ask, or just get a manual - it would make things a lot easier for everyone....FFS

You really don't want pressuized engine vapors flowing into your fuel tank through an itsy bitsy rubber hose or a tiny metal line. Besides the obvious fuel contamination problem and the excessive pressure going into your tank(..duh), if the damn little hose/lines plug up, then you are going to end up with excessive crankcase pressure and start leaking oil all over. Plus when that happens, your fuel tank is going to vacuum lock and you will be dead in the water. Also, you obviously don't want excessive fuel vapors from the other hoses/lines flowing out all over into your engine compartment either, unless you plan on getting a stick and roasting marshmallows over your burning truck's carcass.

So either find some safe way to allow clean air to flow in to your tank to displace the gas that's being pumped out, or switch to some type of a vented cap like I did. And route the pressurized vapors from the valve cover and the bottom of your pan into your air filter, or put a small aftermarket filter on them and vent it out under the hood somewhere safe where it won't make a mess.

And if your engine is a bit tired with a little excessive blow-by, or if you've built up/customized your engine and greatly increased it's hp/torque and compression, then you'll need an oil catch tank or you're going to have a real messy engine compartment every time you drive it hard.

Geez...some times you just need to sit down, get out a pencil and a piece of paper to draw it out, and RTFM. In there it explains how the whole damn thing is supposed to work and why. A manual is only about $15.00 - but if this is one of your first Luvs you've ever worked on - you're gonna be lost as hell without one.

Guessing just gets you into deep shit, and when you're up to your ass in hungry aligators, it's not very comforting to remember someone with a lot more experience and/or training than you tried to warn you that taking a shortcut through the swamp was not a very damn good idea. That's why you have two ears and only one mouth - because you are supposed to freakin' listen twice as much as you speak. And if that pisses anyone off here, how do you think us luvtruck.com old timers feel about this BS right about now?

Now please...play nice before I have to go cut me a friggin' switch...lol

Fulla, on the stock air cleaner, these hoses were hooked up to the cleaner seperatly. The right thing to do on yours would be to run each hose to the Weber filter base seperatly. You would need to drill a couple holes and mount a couple nipples the needed size for the corisponding hose you want to hook up. That way can each either push air into or pull air from the equilized air box.

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OK, I'm over it. Where's the beer?

Ron...we're all pullin' for ya! Even though at this point it probably seems like you are...

Hang in there...

Believe me...we're all behind you. You aren't alone. We got yer back..lol

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'78 1.8L 4-speed Fleetside

The only thing more beautiful than a sunset is a sunrise.

Last reply to this thread for me.

The valve on the firewall that the red hose is attatched to does not function to not allow the fuel to be sucked into the air filter, there is another part of the vapor recovery system that does that. It would help if you understood the workings of the vapor recovery system before you mess with it. Learn the hard way.

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Certified pilots, looking down on people since 1903.

Ya now fulla..if you're always right and the rest of us long term members and Luv owners are alway wrong, why exactly do you ever ask all of us for any advice or opinions in the first place??

Because so far, every time you hijack someone else's thread, cram it chuck-full of your huge pictures to drag it all right back to being all about you and your truck again, all you have done is tell us all and everyone else here that you are right and we are all wrong - and that you know everything about these trucks better than anyone else here that's tried patiently to discuss anything with you.

IMHO that's just proof positive to me that a little knowledge in the wrong hands is a very dangerous thing.

So before this really gets ugly and I or someone else has to apologize to Ben,the staff, and all of the members here again for losing mine or their temper just like last year - someone PLEASE lock this thread - because this is just getting plain ridiculous.

So guys, I'm outta here for a while...because I'm gettin' real tired of this. I'll lurk for a while, check my classified thread and my PM's daily - but I think I need a freakin' break.

I second that motion.
This thread is giving me a headache.

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"You can't please everyone,so you've got to please yourself"

I'm not sure why everyone is losing their heads. This site is to keep our trucks running, and to get good information. When somebody questions why somebody did something, we're not saying you don't know anything, we're simply applying our own knowledge and reasoning, even if it is flawed. Dang... maybe it's just because I'm in school and we're encouraged to question why things work the way they work, and encouraged to think of other ways to do things.

And to let you all know, I got a reply from an engineer buddy, who agrees with you all, that fulla has it hooked up wrong, here is his reasoning,



I'm sorry if anybody was offended that I tried to use my own reasoning vs. taking what was said and doing it without thinking about it. I was wrong, and I stand corrected. Thanks everyone for helping me see how this works.

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-1979 LUV 4x4

Bottom line is I hope we found the correct way to vent the fuel tank, I would hate for someone to come to the site and get bad info.

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Certified pilots, looking down on people since 1903.

wow i guess i should put J/K at the end of posts like that, sarcassism dosnt show in typing that well i suppose.
Anyway all i can say is that those were seperated for a reason. If you combine two systems that werent combined in the first place your asking for trouble. Thats the bottom line its hooked up wrong and you should fix it.

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1980 LUV 4x4, going under re-construction...