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I have a new JPS speedster with the 2130 cc engine with dual Webber carbs with about 300 miles logged so far. Love the car, but when it's stored in an enclosed garage, it's giving off a fair amount of gas fumes from the engine compartment that smells up the garage. I've had the tank revented, and gas lines check for leaks by a qualified mechanic, but I still have an issue. I am looking for ideas on how to correct or is this normal??

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I have a new JPS speedster with the 2130 cc engine with dual Webber carbs with about 300 miles logged so far. Love the car, but when it's stored in an enclosed garage, it's giving off a fair amount of gas fumes from the engine compartment that smells up the garage. I've had the tank revented, and gas lines check for leaks by a qualified mechanic, but I still have an issue. I am looking for ideas on how to correct or is this normal??

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I'm assuming you live in the "Great White North", and the garage is realy tight weather wise.....

If you have no obvious leaks, look at your Weber carbs...They are not built like the old USofA stuff used to be....The entire float bowl is vented into the air cleaner, allowing for a lot of evaporation....

Try placing a plsatic bag of some discription over the air cleaners when you park it and see if this lessens the odor....Bag should fit reasonably close...

Hope this helps...

Leon C.

P.S. Your tank vent does not have to be terribly large either....
Dick, if you give Leon's bag trick a try-put your car keys in a plastic bag also to remind you to remove prior to start. The tanks are supposed to be vented but with a loop in the line causing a trap.
Maybe you are loopless? I just had a lawnmower with a weeping carb
it's amazing how powerful a few drops of fuel can be.
I heard my name mentioned. I have had two gas leakage issue w/ my new JPS/GEM VW 2332, 44 IDFs, standing at around 2500 mi. so far. 1) A cracked carb body at the idle mixture needle valve; fix: replaced w/ new carb. 2) leaking fuel pump that was also overpressurizing the carbs; fix: replaced the fuel pump w/ different type. Item 1) was pretty steady and so a fair amount of gas was making the carb wet; sorta easy to see the source, although deciding the carb body was faulty came only after a lot fooling around. Item 2) was kinda slow ooze and took a while to figure out -- long story told elsewhere here ("Hip bone connected to Thigh Bone". Now fixed, the hot engine in the garage will smell of gas, a bit, because of the natural venting of the carbs, as explained. This is NOT a pressurized FI system you have here -- this is 50s technology. Pretty soon (barring any overt leaks, as described) you will develop a sense for what is a normal hot engine smell, which includes some gasoline vapors mixed in. Nature of the beast. Also, a new engine breaking in will run a little hotter, so will exagerate these aromas a bit. Check the fuel pump, as there is better than even chance it is same as the one I got from JPS. The connections were fine, but there is a small hole in the side of the pump ( for an adjustment screw??), hiding under the label attached, and the gas was leaking, slowly, out this hole.
Kelley et al.....

I (and many of the rest of you on here) am from the "Old School" of the pre-1990's Carburetor vehicles. We KNOW how to live with these little critters. For instance:

We KNOW that they need extra attention when they are cold, and let us know by coughing and puking a lot. We see this as an act of rebelling and take a Macho approach: We Choke the hell out of them!

We KNOW that they bubble over when they're hot and then make the engine hard to start, followed by a different array of coughing and puking, followed by a cloud of black smoke, just to show that they're pissed off.

We KNOW that they often get water condensed on the outside when run in humid weather, and that condensation attracts dust and dirt like a bear to honey, eventually making that small, metal device look like a large, black, featureless, fuzzy mass atop the engine.

We KNOW that a healthy carb produces a constant, steady hiss as the fuel is being vapourized, whilst an unheathy carb sounds more like scrambled eggs frying, with fits and pops and hisses, all mixed together.

We KNOW that an otherwise healthy carb will sometimes, for no good reason and with no intention of malice, "cough up" a large fuel-ball like a cat puking onto your new, white carpet.

We ALSO KNOW, that said fuel ball sometimes ignites within your air cleaner in a futile effort to make it's way to freedom. Often these events are contained within said air cleaner, but others are "Mega-Pukes" with the power to destroy air cleaners, engine covers, rear quarter sections and, sometimes, entire cars.

We SOMETIMES KNOW, that these "Mega-Pukes" are often preceeded by an obscure popping sound, often causing the driver to say to themselves; "hmmmmmm....Wonder what that was?" and then look all around their car, up and down the street, up and down side streets and into all of their rear-view mirrors, buying the "Mega-Puke" fireball time while it's eating it's way out of the air cleaner and heading for freedom.

Competent, experienced, carbureted drivers KNOW that, if they detect a "Mega Puke" fireball in action, that the first line of defense is to MASH THE ACCELERATOR TO THE FLOOR in hopes that the engine will suck it into the cylinder, where it belongs, and devour it. (Hey....works for me!)

We KNOW that no one (or, at least, hardly any one) under the age of 30 years knows a damn thing about a carburetor, nor can they figure out why anyone would ever want to use one when electronic fuel injection works so well.

We ALSO KNOW that those 30-somethings don't know the first thing about getting a carburetored engine to work, no matter if it resides in a car, a boat, a motorcycle or on their lawn mower. They'll sit and stare at it while trying to figure out why it's covered in a black coating of oily fuzz.

Lastly, we KNOW that 753 Bazillion cars, trucks, airplanes, lawn mowers, boats, weed wackers and sex toys have been produced with carbureted engines and THEY all seem to get along, ok.....and yours probably will too........

gn
One of the "Carbureted Speedstah Guys" from South Carolina
(Home of just about every Presidential Candidate this week -
Can you folks Please take them back?)
Gordon,

ATTABOY!!! And you have the cajones to complain about my inimitable writing style?? You got me covered, Speedstah Guy, hands down.

BTW: I know where "Speedstah" comes from (New England, of course), but I wonder how they say it down there in the deep south. How does that go?

Gas, air and spark about covers it -- we don't need no stinkin' fuel galleries, sealed systems, high pressure pumps, flight computers, OBC readers, O2 senors, MAFIs, or any such things. All modernistical contraptions designed to keep the factories (makin' 'em) and mechanics (fixin' 'em) rich.

TTFN,

Kelly
Hey, I'm a 30-something carb guy too... but I would agree that we are probably the exception to the rule...

Dick- since you've had the tank removed and checked the lines, I doubt you've overlooked this, BUT I'll say it anyway. Have you checked the fuel sending unit? VDO stopped making a sealed unit, and they now all have a vent/return nipple directly on the sender. There are other brands w/o this, and plenty of NOS units as well, but just some more food for thought.
Two other things (seriously, for a moment, or at least as seriously as I can be with all these Presidential Candidates running around Beaufort this week)

Does your tank have a vent? Usually there's a small, 1/8" ID tube protruding from the side of the filler neck. It's not for a catheter, it's for a vent. If it's there and has a tube connected, follow the tube to see where it goes (sometimes they end up in the cockpit! - Whooeeyy!) and make sure there's a one-way valve in line. If not, add one. Just go to an auto parts store and get a one-way vacuum diaphragm, such as used on LOTS of Ford emission systems - If you get a Ford one, then the one that's about the diameter of a Quarter and is Black (one side) and Blue (the other side) seems to work well for me. Just place it in the vent line such that air passes toward the tank and not away form it (it's supposed to vent air IN, no out.)

Secondly, as someone (Kelley, when he wasn't laughing up above?) mentioned, these carbs often evaoprate fuel and smell a little when returned to the garage Hot (Kinda like a horse, no?). I don't have a ready cure for this (a LOT of them do it), other than going backward 50 years and using an oil bath air cleaner, or having a garage separated from your house. I chose the latter for both houses, and it works for me.

OK, time to go to Blackstone's for breakfast. The local paper tells us that none of the candidates will be there today, so we can eat our Grits and Shrimp Gravy in peace.

gn
One of the "Speedstah Guys" from Beaufort

Oh, and down here they ask: "Hey! Is that one-a them Porshas?"

Well, sort-of. It's a "Speedstah"

"Oh..............Is that Jap'nese?"
Well, kiss my grits!! Would you look at those Webbies! that is pretty neat, and very nicely done. I'm impressed. So, there's this whole bunch of guys (and gals I guess, angela) who want to turn their carb engines into EFIs,,and there is this other bunch of tuners and car-geeks who want to turn their neat, efficient EFIs into 60's F-1 looking mo-chines? Go figure . . .

I do kinda like those pin-stipes; art comes in all media, and cool shiny car stuff like this is art. And I think Lane laid on a rim-shot.
Some of you have met my son, Chris, at Carlisle, and fewer of you have heard about his 680 hp Mitsubishi Eclipse (under 11.1 in the quarter), and even fewer than that (like, just Lane) have ridden in it (a life-altering experience, to say the least).

What is most impressive of that EFI car (once you get beyond the acceleration), is his ability to alter "jetting" and spark advance curves with either a laptop or a palm pilot. It totally blows me away that he can sit in the car, plug in a laptop and totally change the way it runs, forcing it richer or leaner at different rpm stages or power requirements and tailoring it precisely to what he wants it to do, and then seeing the results of those changes graphed out for him either in real time or captured for playback, in ways that are easily understood.

He can do in seconds what it takes me hours to do properly with carburetors.

Gheeeezzz.........
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