620 rust bucket Posted February 16, 2011 Report Share Posted February 16, 2011 hey so I just bought a weber for my 620. and its burning through fuel like crazy. and its idle is super freakin jumpy. what do I need to do. by the way I'm new to the car world. oh and the hose that goes to the the thing next to the distributor keeps poping off when I high rev should I just use a hose clamp, or what.I am guessing thats why the idle is so jumpy. Quote Link to comment
nismo dr Posted February 16, 2011 Report Share Posted February 16, 2011 I had a 32/36 that ran rich out of the box but it was fine for me because I had a big cam, I traded it to wilmaninid and he had to rejet it to run right for him http://community.ratsun.net/topic/25587-weber-vs-empi-3236-tuning/ Quote Link to comment
620 rust bucket Posted February 16, 2011 Author Report Share Posted February 16, 2011 its not new by the way its and old used Quote Link to comment
justin 620 Posted February 17, 2011 Report Share Posted February 17, 2011 Webers' use a lot of fuel, more then the stock for sure. You may need to adjust the air/fuel screw a lil to figure it out. Also, check you timing first, that could be another cause. If that doesn't do it, there are pages of info on this site that can help you more. Quote Link to comment
fritz Posted February 24, 2011 Report Share Posted February 24, 2011 try a fuel pressure regulator, the weber works best at about 4lbs. for street. any more than that and fuel will blow past the needle and seat, making tuning all but impossible. i run my weber at 3 lbs and love it. also i live at 8000 feet so a re jet was def in order.there are tons of jet kits out there for these carbs and well worth the money. you can buy adjustable fuel pressure regulators at most parts stores right off the shelf. they are universal fit and you want to make sure that you can dial it down to the single digits. give it a shot and share what you think Quote Link to comment
banzai510(hainz) Posted February 24, 2011 Report Share Posted February 24, 2011 MAYBE THE WEIGHTS IN THE DISTRIBUTOR FELL OFF. SPRINGS BROKE. adjust dizzy timming and mixture. do it a couple times. PS the hose that goes to the dizzy(the vacuum adv) is to go at base of carb. I see soem people hook it up to the manifold. This will give bad timming also. Quote Link to comment
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