I need some help with the 600 holly vc carb on my maverick. It is the model 80457. I have a stock 86 roller 302 in it with a performer rpm intake and headers. When I got it together it ran like crap. My uncle adjusted it for me and it ran fine a couple of days then it started to sputter real bad when you get on it. A friend of mine who uilds them took it apart and cleaned it. It had a little rust in it. He also det th fuel and air the way holley says to. It ran great again for about a couple weeks. Today it started to sputter real bad again when I got on it hard. When I got home I took the tank off figuring it was nasty but it wasn't. I put it back on and then I checked the carb. It was also clean inside. I am kinda stumped so if anyone could help it would be appreciated.
Do you have a good filter before the carb.? Is the float level set right front and back? When you say there was rust in it do you mean there was was floating in the fuel bowl? Clint
I do have a fuel filter before the carb. The floats are set right according to my buddy. It will run fine a little while and then it will mess up again
kinda seems like after a while it is not getting enough gas. It has a new manual fuel pump and it keeps the filter full.
accelarator pump? diaphram in the fuel pump? worn lobe on the cam shaft that drives the manual fuel pump im no expert but these are some good places to look.pull your fuel line at the carb disconnect the coil wire at distibuter crank it over a few times to make sure you are getting good fuel delivery to the carb. better yet take coil wire off the coil too so you dont make a spark while playing with gas. put fuel line into a pop bottle to catch fuel.if your getting good fuel to carb recheck floats and acc. pump just a few places i would check. do you have someone you can borrow an electric fuel pump from put it back at the tank to help push the fuel to the carb to see if that solves the problem. just my thoughts hope this helps john
I have a clear filter up by the carb and it stays full. It will run fine one day and then not te next. come to think of it this carb has done the same thing on several vehicles
it could be that the coil is going bad and when it heats up the spark is to weak. what coil are you using?
With the motor running at idle, take out the sight plug on the side of the front bowl. Gas should just trickle out. If it doesn't, or if it pours out, loosen the set screw in the float adjustment, then take a 5/8" wrench and adjust the nut up or down until the fuel just trickles out. Clockwise drops the gas level, counter clockwise raises it. After you get the front bowl float adjusted,retighten the set screw, holding the nut so it doesn't turn, then do the same for the back. Mine would run fine until you got on it, then it would spit and pop. Turned out the rear float was adjusted down to far, keeping the real bowl almost dry. Probably was done to try and get better fuel mileage! Oh, and make sure the choke plate isn't sticking, too.
Better yet, what ignition system is he running? Most "carb problems" are ignition related. Be that as it may, old carbs can and do get to the point where they're tempermental. One tiny little piece of trash in the metering block can ruin your whole day.
You ever notice when someone has a problem with an Edelbrock carb that there are usually 3 or 4 obnoxious people that have to jump in immediately and scream and shout the person should buy a Holley to I guess appease their self righteousness........ But when there is someone with a problem with a Holley carb the Edelbrock/Carter owners(currently excluding me) are courteous enough to let the people that are knowledgeable about Holleys help so that the problem can be resolved.....stirthepot: (here is a perfect example especially considering he was just looking for some parts and not some help on tuning or anything http://mmb.maverick.to/showthread.php?t=61533)
He was looking for parts ? Where in the first post of this thread did it say that ? And we can't help it if you choose to run "off brand" carbs 90% of "carb" problems are related to the ignition tuning. Anyone who knows carbs, knows this. This is especially true if you're running a points ignition.
You say you're running a clear filter. Is it one of the glass ones you can take apart? If so, trash will get through those...I know. I have one on my car but also put a canister type one back at the tank. I was having to clean mine out every couple weeks or so before I did that with about the same problem. As stated, one small speck of trash can cause your problem. After you verify you don't have ignition problems I would clean everything again including blowing out the metering plates and add a second filter somewhere before the clear one you have.
