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Need not pump it more than 2 times to the floor at the most, otherwise it will flood the crap out of it. The carb has pumps front and rear and yes does have a choke and yes the acc pumps are putting out good solid streams and yes the bowls are full to where they should be. Mind you I have been...

Some updates to your responses. Good info on the Ethanol, especially the hydroscopic aspect...thanks. Yes it is a good electric fuel pump, with dual Fram filters coming out of the tank and a full return line. When I go to start I turn on the fuel pump and let the pressure come up to a steady...

Interesting!

I have had my Dart running for 10 years has never had a problem except for starting after setting for a couple of months. Specs….408, aluminum heads, 10.6 cr, Mallory hyfire, cell in the trunk, hi volume electric pump going to a bypass regulator under the hood, bypass line back to the cell...

Thanks to all for your thoughts...the car was doing the same thing before replacing with a "new in box" pertronix. The engine is totally stock and the new dist. does not have vacuum advance, just one he bought as a spare. I have been thru a hundred Q-Jets and had already checked all the...

I really need some suggestions. I am a Mopar guy, but my buddy has a 69 big block Chevelle and I am stumped. It has a Q-jet with automatic. When rolling about 40 mph in 3rd and you barely increase the throttle it starts stumbling and even loses all power until you back off the throttle a bit...

Thanks skep...it is a thick phenolic spacer about 3/8" of an inch. I am taking a week off in about a month and have a new champion radiator and dual electric fans to install also. When initially building the car my plan was only about 400 hp and that's the BeCool radiator I have in in now...

Could you please posts some pictures of your bypass regulator at the carb. I am going from a deadhead to a bypass in the next couple of weeks and am going to be gathering the fittings and like and would like some ideas. Here is a picture of my current system. Also, the reason for the change...

Thanks Leanna, guess I should stop procrastinating and give it a shot. I have never had this problem with other vehicles, but this engine is not like other cars I have had.

After not starting for a couple or a few months, it was a sumb**tch, to get the Dart going...crank, crank, sputter, backfire, then when it does catch, afterfire in the exhaust. Pull the plugs and they are black and wet with fuel. I finally have started draining the front bowl of the carb and...

russhal...yeah, I like to acknowledge the effort people take to help with my issues. I was super happy with the 750HP after getting it dialed in, no lag, no hesitation, just instant wwwaaaaa! I just did not like the hard starting when cold. If I cannot get the carb dialed in with idle jets, I...

Yep, did do that, went up 2 sizes at the recommendation of QF tech. Was able to get some adjustment of the idle screws, but now am running into a problem with it randomly popping loud in the exhaust, about every half second. The idle screws were at about 3/4 turn out (gave me the highest vac)...

I am at 24 initial with about 36 total. Here are most of my specs... • Current CID 408 91 LA block .030 over, zero deck, line bored, Hughes Main girdle Extensive oil system mods Melling oil pump • Kevco oil pan and pickup with large pickup tube • Scat forged 4.00” crank...

Hi All, Have always been happy with my Holley 750 HP, except when starting cold. There is no choke and would take about 4 to 5 times of starting to keep running, then good. I purchased a new Quickfuel 850 with mechanical secondaries and electric choke. Throttle response is markedly...

Couple more pennnies...I don't have a choke and have to run for about 90 seconds to idle down. It then gets crisp on the throttle. I am at 24 initial on timing, but pretty hefty bump stick, .614 with 256 @ .050. If you don't find a vacuum problem, advanced your initial to where your starter...

Sure sounds like vacuum or timing thing (spark or cam) to me. Also, on your initial start....did not look it up, but does the carb have a choke? If it is a vacuum leak and the choke is set correct, then you are way too lean and will not run when cold. I guess same would hold true with the...

Yes, electric pump. Always watch the fuel pressure gage to get up to pressure indicating bowls full. Was getting fuel shot out of the squirters before attempting to start.

No stabilizer..........dumb me!!

I started the Dart yesterday, but it took a lonnnnggggg time to start. Wondering if the older 93 octane gas contributed to the difficulty. Here's the details.... Sitting in garage with temps going from 30 degrees to 60 degrees for the past 5 months Holley HP 750 (no choke) (I may switch...

Happy to hear you found many of the problems. Not quite sure I understand your vacuum question, but think this is the answer.....You need to find out how many inches of vacuum you are pulling, at idle and in gear, if you have an automatic. If you are pulling 10 inches, divide that in half and...

x3 on the float issue..... Could be one of the needle and seat damaged or dirt imbedded in the needle on the rear carb. If the engine does idle, look down into that carb when running. Do you see any dripping out of the booster legs, you should not, fuel should be atomized so as not to see...

Thanks guys...... Yep, only 1500 miles. I have 2 Fram filters run parallel right off the bottom of the fuel cell. Braided lines from cell to filters to pump, to regulator up front and to the carb. No leaks anywhere. Was meticulously clean on install, blowing out lines, etc. Pump seams to...

I have an Edelbrock 1792 electric pump. The Dart has about 1500 miles on it. I had set the pressure on the regulator to 6.5 psi. Yesterday on the way home, it kept going down.......down to 3.5 psi by the time I got home. Pump did not sound the same, like it was not under a load. Sound like...

I know for sure these other guys have more experience than I on this. Just to give my 2 cents here. I probably am too small with my 408 in the carb area, but running a Holley 750 hp dp. Very streetable with 904, 3500 verter and 4.10's, zero bog. Had to do quite a bit of tuning due to stout...

:happy1:

Yes, it probably sounds like a good plan. But make sure you check all the other issues, and it pretty much sounds like you have been doing this, before you proceed with the smaller carb. Good Luck!!

Also, look down the barrels while running. Are you getting any dripping from the boosters? You should not have any and this would mean you are pulling fuel from the main jet circuit. Check what cudavert said on the idle screws. Granted you probably are a little big on the carb, but I believe...

Mostly same with everyone else here.... Get the timing squared away first and foremost. Plenty of threads on the board about this. Are you pulling 19 inches of vacuum at idle? Your primary PV should be half of that, if not you may be dumping fuel from that circuit. Do the idle screws have...

Just Google elevation for your current city or location. Your elev. at Springville was around 640' above sea level.

You stated you previously lived in Indiana. What was your elevation then and what is it now? I would imagine that you have gone up in altitude quite a bit and in doing so, you are probably running too rich. If this is the fact, you need to go back to some basic things in tuning your Holley...