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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

AOAI 2024 Detroit, First-Ever Media Day Event Featuring Detroit’s Own Surfer Joe! AOAI 2024 Detroit: September 17-21, 2024 – come early, stay late! And here’s another reason why… On Saturday, September 21, starting at 10 a.m., join us for a duo of AOAI First-Evers - Media Day and Detroit’s own D.J., Surfer Joe. Surfer Joe promises to play those special tunes we sang and danced to as we grew up! We “hear” Surfer Joe just may even play a few Avanti and Studebaker tunes. So, Avanti Ladies, put on those Bobby Socks, bring your fav sweetie, and come join us as we dance to the tunes and ogle Avanti automobiles! Meet Surfer Joe here: https://www.youtube.com/watch?v=ieCHhIjx-_Y If you’ve not yet registered for the Avanti Owners Association International 2024 Detroit, there is still time! Online reservations may be found at: https://aoai.org/shop/aoai-2024-detroit-international-meet/ While registering, be sure to look at the tours, Concours and Authenticity Shows, and the awards Banquet on Friday night. See: https://aoai.org/aoai-2024-detroit-driving-tours/ Host hotel reservations may be made at: https://www.hilton.com/en/attend-my-event/dttlies-xao-5fe53cdd-ef5c-40fe-9f57-f37061f7c48c/ Yes, Embassy Suites is a Hilton property and when you call be sure to tell them you are with AOAI 2024 Detroit to secure the best-possible rate. Registration at Embassy Suites opens at 1 p.m. EDST on Tuesday, September 17 and wraps up with Media Day on Saturday, September 22. Our meet-only rate is good for two days before AND after our scheduled meet.

Mark There are 3 tests you will want to do. pressure, volume and inlet vacuum They are outlined in the Avanti workshop manual. New filter? There must be some reason the return line was capped off???

Thanks, A0136. This is very helpful. Today I was talking to a fellow gearhead about this where I work, and he suggested I install a fuel pressure gauge and measure the output pressure under various conditions to help troubleshoot the problem. These numbers will help.

I'm not sure how to send messages either! Those panels were made out of metal. There was a complete belly pan as well. The car was run in 63 with several different configurations. Some runs with the full pan and skirts, runs with just the skirts, some with nothing at all, and even down to different wheels.