Fispa fuel pump...
Fispa fuel pump...
Would somebody care to remember which way the actuator arm (sheet metal pieces connecting the actuator to diaphragm) are installed? I think I know which way to install it, but my notes are not 100% clear and I would like to be sure...
http://koti.welho.com/kpietil4/osia/img_3766.jpg
http://koti.welho.com/kpietil4/osia/img_3767.jpg
http://koti.welho.com/kpietil4/osia/img_3766.jpg
http://koti.welho.com/kpietil4/osia/img_3767.jpg
250 GT 2+2 3197/GT
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- Posts: 1206
- Joined: Thu Jan 22, 2004 5:53 pm
Kare,
What specific area are you having problems with on the arms as far as assembly? I have a spare pump in pieces so perhaps we can go through it together if you want. The arms are notorious for breaking and cracking.
I ended up making my own arms out of stronger metal and it works fine. Both my electrical and mechanical pump went out within two miles of each other. I don't want to ever have to push that car off the freeway again ( was 1/2 mile).
Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705
What specific area are you having problems with on the arms as far as assembly? I have a spare pump in pieces so perhaps we can go through it together if you want. The arms are notorious for breaking and cracking.
I ended up making my own arms out of stronger metal and it works fine. Both my electrical and mechanical pump went out within two miles of each other. I don't want to ever have to push that car off the freeway again ( was 1/2 mile).
Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705
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- Joined: Wed Sep 04, 2002 12:13 am
- Location: San Francisco Area
Hi Kare,
They are supposed to be as per your 3767.jpg. It makes a big difference from one way to the other. If everything is as factory spec, and you run the pump with the tabs installed per 3766.jpg, the tabs will shatter after a few miles. This is from personal experience.
However, if the push rod is mushroomed or the "pad" is dimpled badly, the pump's delivery volume will diminish. By flipping the tabs to work per 3766.jpg, you may remedy the problem of fuel starvation. Again, from personal experience.
john
They are supposed to be as per your 3767.jpg. It makes a big difference from one way to the other. If everything is as factory spec, and you run the pump with the tabs installed per 3766.jpg, the tabs will shatter after a few miles. This is from personal experience.
However, if the push rod is mushroomed or the "pad" is dimpled badly, the pump's delivery volume will diminish. By flipping the tabs to work per 3766.jpg, you may remedy the problem of fuel starvation. Again, from personal experience.
john
PF Coupe
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- Posts: 1910
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Hi Rudy,
My friend's GTB had that same problem, where the shaft would slowly creep out of its hole. The fix way easy: Loctite.
On another subject, those flat tabs are hardened steel. They can take some serious load, but if you abuse them they will break. They are easy enough to replace and in fact a number of them have been replace, albeit, with stock from the local hardware store. Which means they flex and bend into a comfortable shape and by doing so reduce stroke, and thus, fuel delivery.
john
My friend's GTB had that same problem, where the shaft would slowly creep out of its hole. The fix way easy: Loctite.
On another subject, those flat tabs are hardened steel. They can take some serious load, but if you abuse them they will break. They are easy enough to replace and in fact a number of them have been replace, albeit, with stock from the local hardware store. Which means they flex and bend into a comfortable shape and by doing so reduce stroke, and thus, fuel delivery.
john
PF Coupe
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Hi John,
Yes, my arms had been installed upside down and just like with your experience, broke after ten miles.. The shaft was still firmly in place yet
broken right in the middle. Another saga in the continuing series of catastrophic failure tales.
Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705
Yes, my arms had been installed upside down and just like with your experience, broke after ten miles.. The shaft was still firmly in place yet
broken right in the middle. Another saga in the continuing series of catastrophic failure tales.
Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705
A complicated design, where the first part to break will be a pair of simple steel tabs is IMO a very clever and usefriendly design!John Vardanian wrote:On another subject, those flat tabs are hardened steel. They can take some serious load, but if you abuse them they will break. They are easy enough to replace and in fact a number of them have been replace, albeit, with stock from the local hardware store.
250 GT 2+2 3197/GT
Re: Fispa fuel pump...
Kare,kare wrote:Would somebody care to remember which way the actuator arm (sheet metal pieces connecting the actuator to diaphragm) are installed? I think I know which way to install it, but my notes are not 100% clear and I would like to be sure...
http://koti.welho.com/kpietil4/osia/img_3766.jpg
http://koti.welho.com/kpietil4/osia/img_3767.jpg
You have a PM regarding this old 2008 post.
Tom Kizer
So many sidewalk cafés - so little time left.
1969 365 GT 2+2 S/N 12293 (Gone but not forgotten)
1967 230 SL 4-spd (Currently on CPR)
1969 365 GT 2+2 S/N 12293 (Gone but not forgotten)
1967 230 SL 4-spd (Currently on CPR)
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- Posts: 1206
- Joined: Thu Jan 22, 2004 5:53 pm
Re: Fispa fuel pump...
In the correct way...
Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705
Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705