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Old 05-09-2003, 07:31 AM
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Post edelbrock carb problems

I have an elelbrock 600 #1406 on my 74 chevy pickup. Just lately I have had all sorts of problems out of this carburator. For instance yesterday it died twice and seemed really loaded up when I finally got it started again. After it dies the fuel filter goes empty? So I put a new factory replacement carter fuel pump on. Then on the way to the gas station it dies again when I let off the gas. This time when I pop the hood I have fuel dripping on the the intake from the passenger side of the carb, which is really heavy flooding. Then I think the carb gasket might be causing the butterflies not to shut all the way. So I put on an Edelbrock insulator gasket. Seems to run fine but idles really rough. I drive it on a short run and come back and it still idles rough. I try adjusting the air/fuel idle screws, but it doesn't help much. Also it idles at 750 rpm in drive and I can't adjust it any lower. Then this morning I suddenly have no choke. Also, it ran like crap at anything below 1500 rpm and would barely even idle. Also it kept having miniature backfires through the carb. Barely auditable, but it's like the engine cuts out each time. Any help is GREAT!

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Old 05-09-2003, 08:30 AM
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I have two of the 600's on my engine & have had really good luck with them. I would suggest removing the top of the carb. & throughly clean the needle-seat & float bowls. It sounds like dirt in the needle & seat. Also be sure & check the float level & condition of the floats. good luck.
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Old 05-09-2003, 08:40 AM
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Slow Bills advice sounds good. I run two 750s on different bigblocks, the only trouble i`ve had was dirt or water. Trash under the needle valve will cause flooding, which the eng. will handle at higher rpm. Don`t run it that way very long as it will wash down the rings and scour the walls.
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Old 05-09-2003, 11:16 PM
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74 did you buy the carb new??? If not, you can download the manual for the carb of the Edlebrock web site.. I was having similar problems with my 600 Edlebrock a couple of months ago. Have you checked the float levels? The fuel dripping you mentioned is caused from improper float levels. What about the metering rods and metering springs?? Your problem of running like crap below 1500 sounds like improper meetering rod and spring rate. It sounds like it is running to rich at low rpm....Hope this helps.......

[ May 10, 2003: Message edited by: black66 ]</p>
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Old 05-10-2003, 12:28 AM
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I agree with the other posts, if your sure the float level is set correctly afterwards and it still doesn`t idle well or still drips, check the fuel pressure. I was having a similair problem as your having not too long ago, and it was excessive fuel pressure. one thing that also says the fuel pressure is out of hand is no adjustment on the idle mixture screws and since it won`t idle down. Another test you can do after the float is set is at idle, shine a light into the primary throat of the carb, if you see fuel dripping out of the boosters, you know it`s fuel pressure. good luck.

[ May 10, 2003: Message edited by: DoubleVision ]</p>
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Old 04-21-2009, 10:28 AM
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Carb Problem

I have the same problem it goes away for months then comes back I'm going to check the boosters
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Old 04-21-2009, 11:29 AM
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Get a better fuel filter. max fuel pressure should be 5.5#'s. Get a fuel pressure regulator (or change the pump) if its more than this.
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