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Hi,
this is Uli from Germany and I have a question about my external fuel filter GF-432.
I have a 69 Small Block with original inake manifold, rochester carburetor and mechanical fuel pump ( only in and out fuel line , no return line to the tank ).
Between fuel pump and carburetor the fuel filter GF-432 ( with return fuel line to the tank ) ist installed.
I´m going to let change intake manifold and carburetor , Edelbrock manifold 2101 and carburetor 1406 ( with electric choke ) will be the new ones.
Fuel pump should remain the old one.
What about the fuel filter GF-432 ? Had it to leave in the new system or can it be removed ?
Will the Edelbrock 1406 work without this external fuel filter ?
From: At my Bar drinking and wrenching in Lafayette Colorado
Why in the world would you remove a high performance 750 cfm carb and install an old, piece of junk 600 cfm carb that was deemed to be obsolete by GM in 1966? That's a really bad idea....
Why in the world would you remove a high performance 750 cfm carb and install an old, piece of junk 600 cfm carb that was deemed to be obsolete by GM in 1966? That's a really bad idea....
Ditto. OP. You have the attention of THE GUY that restores quadrajets to their former glory. If you have a suspected carb problem how about taking some pictures and sending to Lars for him to look at. He’ll probably be able to tell you if it can be rebuilt by the pictures.
Ditto. OP. You have the attention of THE GUY that restores quadrajets to their former glory. If you have a suspected carb problem how about taking some pictures and sending to Lars for him to look at. He’ll probably be able to tell you if it can be rebuilt by the pictures.
Very true, all that you say, however OP lives in Germany.
From: At my Bar drinking and wrenching in Lafayette Colorado
Unfortunately, every guy with a GM musclecar in Europe ends up with a junk-yard Q-Jet that some rip-off guy in the U.S. sold him. I haven't seen a good, original, well-running Q-Jet on a European car for my entire 40-year career in this business. Americans sell these poor guys junk, and then they (the European enthusiasts) try to repair and restore the junk crap-*** parts they've been sold (or that came on the crap-*** export cars that they bought from rip-off artists). It's a bad situation. But swapping out a Q-Jet for a horrible, obsolete Carter AFB re-pop is a really sorry situation. Send me some photos of the Q-Jet so I can tell you if the carb is terminal and needs to be replaced with a piece of crap Edelbrock AFB re-pop.
Thank you for your answers and comments !
I believe it would be better to have restored my Rochester und Lars would do a great job.
I will not throw away my Rochester and will have it restored in the future.
But at the moment I would like to change to Edelbrock components.
It would be great if someone could be able to answer my technical question about using the 1406 without the GF-432 and a returning fuel line to the tank.
Would it be possible or would there be a problem with it ( pressure to carburetor to high ? ) .
And I yet another time in Australia. Yet we all can wait.
These cars are a hobby. No need to rush.
Save a day or a week now and regret for years to come.
Take your time.
The reason I believe that filter was added was to provide a return line. Probably because the current fuel pump does not provide it.
The issue you may encounter if you eliminate it is vapor lock. Where the fuel in the line gets too hot and boils. By having a return line via the filter it helps to keep a cool fuel supply in the line to the carb.
The pressure from the pump is unknown. If much over about 5 to 6 psi the needle valve may get lifted off the seat and you'll have flooding problems.
From: At my Bar drinking and wrenching in Lafayette Colorado
Received the photos from Uli. His carb is a commercially rebuilt carb, but does not appear to be too badly hacked. The major parts & components on the carb appear to be 1969-correct, but the carb looks like it could use a good rebuild, cleanup, and proper setup. The problem, of course, is to find someone in Europe that can do a good job of that... His biggest problem related to performance is that he has his throttle cable attached to the top-most cable hole in his throttle lever, which means he is not getting wide open throttle out of the carb - he needs to re-locate the throttle attach ball to the lower hole in the throttle lever. This should address his "lack or performance" issues with the carb, if the rest of the carb is set up anywhere close to spec. In its current configuration he's not getting much, if any, action out of his secondaries, so he is effectively running a 300 cfm carb....
From: At my Bar drinking and wrenching in Lafayette Colorado
There is no need to replace the carb or remove the filter. The stock system is the best performing setup he can use if it's set up correctly and tuned right. It will knock the socks off of any Edelbrock "Performer" 600 cfm system.
Lars
Thank you all for your answers , help and tips !
First I will hook up the throttle cable to the right hole at the lever.
The GF-432 will remain in the system as you recommended .
I´ll try ( and hope ) to find someone who is competend to rebuild my Rochester.
In the meantime I let install the 1406 because I want to drive my car.
Current Problem with my car :
Sometimes my engine does not run good, gets not enough fuel - less power .
Fuel pump works good, as it should do. It´s definitely a problem with the carburetor.
From: At my Bar drinking and wrenching in Lafayette Colorado
Further info shows that Uli's carb is a 7029207, which is the high performance L46 carb. This is one of the best carbs ever produced by Rochester, and one of the best carbs ever installed on a GM car. There is not another carb that will outperfrom a properly set up 7029207.
Lars
Uli, if Lars is willing and can rebuild it I’m sure the whole community here is going to recommend you get it rebuilt. If he can’t rebuild it then that would be a real bummer.
Thank you all for your answers , help and tips !
First I will hook up the throttle cable to the right hole at the lever.
The GF-432 will remain in the system as you recommended .
I´ll try ( and hope ) to find someone who is competend to rebuild my Rochester.
In the meantime I let install the 1406 because I want to drive my car.
Current Problem with my car :
Sometimes my engine does not run good, gets not enough fuel - less power .
Fuel pump works good, as it should do. It´s definitely a problem with the carburetor.
Uli
The 1406 will not fit the stock manifold, it is a square bore carburetor. The Quadrajet is a spreadbore carburetor.
Have you checked the distributor advance weights and springs for free movement?
Have you set point dwell and checked initial timing?
Have you tested fuel pressure?
Uli, if Lars is willing and can rebuild it I’m sure the whole community here is going to recommend you get it rebuilt. If he can’t rebuild it then that would be a real bummer.
I´m sure Lars can rebuild it and if I friendly ask him he would do it !
Problem are the high shipping costs from Germany to the USA and back to me after the rebuild. I will check.
The 1406 will not fit the stock manifold, it is a square bore carburetor. The Quadrajet is a spreadbore carburetor.
Have you checked the distributor advance weights and springs for free movement?
Have you set point dwell and checked initial timing?
Have you tested fuel pressure?
The manifold will be changed to a Edelbrock 2101 .
There is a HEI installed .
Fuel pressure has not been tested.
External Fuel Filter 1969 Small Block
There is no need to replace the carb or remove the filter. The stock system is the best performing setup he can use if it's set up correctly and tuned right. It will knock the socks off of any Edelbrock "Performer" 600 cfm system.