Long story short: I had to go inline with a filter so as not to deal with the inlet leaking. I first tried some jb weld and think I may have left some bejind. The car starts right up and revs correctly, but under any acceleration- hard or nice and easy, it is very slow. Or ot seems fine and when I go up tje street only to kill. I noticed tje first time trying to start after it killed, fuel was coming out the top of tje accel. pump. Is checking out tje seats an easy job? I am skittish about this as I can destroy a loaf of bread removing the twist tie.
I am laughing at your loaf of bread reference. If you have fuel coming out the top, then you needle/seat and or float are letting too much fuel in. You already knew that though. Haha. You would have to take the top off of the carb and pull the float out and needle/seat. Probably need an accelerator pump at the minimum. Might as well get a kit and do it all so you can get it all cleaned out. Taking the air horn (top) off requires you to take out the 9 screws and the accelerator pump arm. There is a roll pin holding the arm and you would want to punch it through just enough to release the arm. You also want to remove the secondary rods and hanger by removing the very small screw in the center of the secondaries. Hope this helps. I can get some other pictures if that would help. I am building a 7042940 800 cfm quadrajet now that will be for sale, or I could fix yours if you need that.
Thanks. Could the new inline filter be too non-restrictive and that's why this is happening? I'm still confused as to what's going on wrong intjere.
Can you check the psi of the fuel going in to the carb? For a quadrajet, 4 to 4.5 psi. Since you have fuel coming out of the top, it doesn't sound like fuel getting to the carb is a problem. Did you use tape thread to seal anywhere? If that comes loose, then it could also get inside the carb. By the way, what carb is it you are working on? Do you know the number? If it is original carb, then the long fuel inlet in to the carb has a plastic gasket at the end of the threads that seal against the carb inside the threaded fuel inlet. If that was lost, then that might be you fuel inlet sealing problem. If you have some rubber hose somewhere in your fuel line, pinch it off while the engine is idling and let the engine die. Then crank and restart. Sometimes, that will let some junk get out of the way of whatever it is blocking. Temporary fix, but sometimes works.
One thing I figured out is I definitely need a spare carb. I think I should buy a core and look at some of tje dtep by step videos out there. I already have Clif's book, but I have three shows, including Cruisin' the Coast over the next three weeks. I should also think about buying one already purpose built for the 455. What do they run nowadays? I spoke to my guy who has rebuilt hundreds of q-jets and loves them. At his suggestion, we are doing a complete rebuild. His worry is that simply removing the air horn might not get it all or address every need it (probably) might have. Also , we discussed the "new gaskets and such" out now and he assures me tje borg/warner kits include everything, but most importantly use materials that will stamd up to todays fuel. Not that I EVER use ethanol. I couldn't remember if the B/W was acceptable. Anymore. I will post our findings for the next dude....... Thanks for the suggestions.
Mark, I thought that 6 psi was the max a Q-jet could handle. According to Cliff Ruggles and JW, they can take a lot more. I am currently using the billet aluminum pump that Jim sells, and it is rated at 8-9 psi at idle. I had Jim go through my John Osborne carburetor (7042240) for use on my roller motor. I was under the impression that I would need a regulator to go from the 1000 Holley type carburetor to the Q-jet, but Jim told me to just bolt it on and go. It seems to handle it fine. I have an Autometer full sweep electrical fuel pressure gauge with the sending unit right at the fuel inlet. I routinely see the pressure right at 8-9 psi, with occasional readings of 10 psi. No evidence of flooding. Even Holley says no more than 7 psi for their carbs, but my AED 1000 HO handles it great also. http://www.v8buick.com/showthread.php?269332-What-PSi-on-Q-Jet&p=2215167&highlight=#post2215167 http://www.v8buick.com/showthread.p...acceleration&p=2088866&highlight=#post2088866
That's good Larry. They can handle more in good circumstances. I think I ran just over 5-6 and the volume is the key to keep the small bowl full. Cliff also points out 1/3rd of the big brand kits needle/seats won't seal fully with low pressure. Poppaluv. I recommend you get a kit from cliffshighperformance.com or Gessler at quadrajet parts.com. They will sell you a kit for your carb with proven parts.
