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Stacy... We've discussed this before...but.. Wifey doesn't want to wear a flak vest? Ya know, growing up around areas like that, ya develop a "street sense" and avoid areas of trouble, The hair on Your neck stands up and ya move along. My prayer/desire is for those who didn't grown up like that will be safe since they are not ''street savvy''. These folks just blindly enter into bad situations. The best of my understanding this Hotel is in Livonia, which at one time was a fairly safe community. The Problem is the event has road tours into bad areas. I LOVED the Henry Ford Museum, in Dearborn, but that area at this time has gone heavily Muslim, and sorta in a corrupted way...(Hey, Y'all believe as Ya wish..just don't get violent with me).... I do understand there is a South Bend. Indiana Meet in May..That would be a consideration, since it is the birthplace of Studie.

I appreciate everyone's help. I'm definitely missing the return hose nipple with the .043 orifice. The one I installed is a standard nipple for a 1/4 in inside diameter return hose. The inside diameter of the nipple is probably too large and allowing too much fuel to bypass back to the tank. I checked my shop and parts manuals. The 0308-8 group of parts is for the return line, and one nipple p/n 1558295 is listed, but there's no other description, and the parts are not illustrated. Is p/n 1558295 the correct nipple I'm looking for? I'll call around to see if I can find one. If not, I imagine I can make a brass plug to fit inside a standard nipple and drill a .043 hole through it.

If you’re not worried about keeping original a filter like this would work. Just run a 1/4” hose down to the return line. this is a NAPA 3054 filter

This is a picture from the work shop manual. The second picture is a screen grab from a posting on rebuilding an R series pump. I had time to dig thru some boxes today and found the restrictor fitting from R1358. The third and fourth picture show the restrictor fitting. A #57 (.043) drill bit just fits snuggly.

Excellent reply, as i too saw that it was going to be held in Detroit, where I was from and wondered who decided that? Not where I would have picked for that kind of gathering as there are many other nice suburbs in the area outside of metro Detroit that could and would have been acceptible. I asked my wife yesterday want to go? got that look, and a big NO!!!

My Avanti is an early 1963 model with the return line coming off the side of the fuel pump. R1204. The "T" fitting was still installed on the side of my pump. The port for the return line was plugged with a NPT pipe plug. I didn't remove the T from the pump since the line to the carburetor was still attached. One of my suspicions was that the return line needed a restriction somewhere to maintain adequate flow to the carburetor. I mentioned I installed a check valve in the return line. I suspect the rhythmic nature of the problem may be from the fuel pump developing enough pressure in the return line to overcome the cracking pressure of the check valve. My theory is: the engine runs fine while the check valve is closed, but once it opens, the fuel flow back to the tank is unrestricted and causes reduced flow to the carburetor and the rough running. Once the pressure in the return line drops off, the check valve closes and allows fuel to resume flowing to the carburetor until pressure builds up again, then the cycle repeats. Yes, it caused the car to buck between proper acceleration and poor acceleration as the cycle repeated itself. About one half to one second of running poor before switching back, then one half to one second of running well before switching back again. As long as I drove it easy, there was no problem.

Which year?

WOW!…..This is one VERY special Avanti!

Agreed!….Agreed!!

I visited his shop once. Dan has an amazing inventory of parts and is very knowledgeable (yeah, and opinionated). I’d love to attend his seminar at AOAI 24 get together, but not in the cards for this year.

Does anyone have a picture of this restrictor and return line to post?,,,

If it’s of any help, I was able to purchase the fitting from Jon Myer a few years ago, he may still have them. Mine is a 63 so the fitting was on the fuel pump return.

Click on the persons name to open up there profile and then look for the envelope symbol. Press that and you can send a PM. PS a very interesting topic, I get the feeling Anthony may have some interesting information. Peter

Anthony. Since you visit so infrequently, I have a question off this topic but would like the information. What do you know about Joe Granatelli’s Cadillac Avanti? Did it arrived with no engine or an R1. I suspect it was supposed to get an R4 with ac as when I looked at the car it had the lowered front control arms.

Another question answered.

Ah-ha!!….. I was thinking those custom rear skirts on the ‘Due Cento’ were made of metal…. and probably a fairly thick gauge… adding weight over the rear wheels aiding traction, and also preventing ‘oil canning’ at high speed!

I sorta gave my answer about attending, on another thread where they said the meet-up was cancelled, So now it looks like it's back on. Sorry to be a downer here folks but the area is totally unsafe and under Policed. as would be Chicago or Atlanta or any other ''out of control'' City-Scape. Also what I'm not seeing is an address where this Hotel is at and IF that is where the venue is being staged. And a Detroit Driving Tour? No thanks. That's just asking for a Car-Jacking at gunpoint.. I grew up in the Detroit Burbs.. Since 1967 when the Riots happened that City still hasn't recovered and the homicide rate is thru the roof... as well as other crimes. Homicides exceed Chicago and Atlanta by a good margin when calc'ed by ''X'#'s per 1000 of population. Why Y'all aren't setting this up in the Burbs like Pontiac where the Police at least have some control is beyond me. So for the reason of Personal Safety and Property Theft, I won't be attending. ....... I might add... If Ya want the Studie Experience, why isn't this being held in South Bend, Indiana. The Home of Studebaker?

Mark L, which year Studebaker Avanti is your car: '63 or '64? The restrictor is at the fuel pump on '63s and up at the filter closer to the carb on '64s. That the car's problem only began after you reattached the return line is suspicious. --Dwight

Is the restrictor listed as a stand-alone part in the parts catalog?

I don’t have a fitting that I can get to to measure the restriction. Hopefully someone else here does

Footer: Thanks! I just bought a set of door strikes from him. Don't know how I missed it.

I don't think they are the original. Is the restrictor in the fittings at the pump for the return line? What is the inside diameter of the restrictor?

Did you still have the original fittings. I believe there is a restrictor in the fitting.

I have a copy of the shop manual, so I'll be consulting it. The current filter has a solid metal housing, so I can't see the condition of the filter without destroying it. I'm going to replace it to be sure it's clean. I'll cut the old one open to see what is inside. The return line was capped off long ago, based on the patina of the plug and the poor condition of the hose. The maintenance receipts I have show the fuel pump was replaced within the past 15 years or so, but no reason as to why, or why the return line was capped off when it was replaced. It might have been the "solution" to this issue. Before I restored the return line to the original condition, it was running fine. That's why I want to test the output of the pump. It may have sufficient capacity under load with the return line capped off, but insufficient capacity under load when the return line is connected.

Hello Considering a 1989 Avanti, with 350. Anything to look for? Hog troughs fine. Any way to lower the front end? Thanks, Stuart