Adjusting floats on quickfuel

[69clone]

I'm sure this is a stupid question but what am I doing wrong. The sights are completely full. I turned the screw alittle and loosen the nut and the fuel level started to drop and stayed in the middle so I left the nut at that position and tightened the screw down. Started it up and fuel shot up about a foot through the chimney? Picture of what I'm talking about. I shut it off and the floats are full again. So I take it I raised the pressure not lowered it. I assume I need to tighten both the nut and screw more clockwise? I was going to install my fuel gauge but I'm afraid if that happens again gas might get on the headers or something...

 

[kiwigtx]

I'm sure this is a stupid question but what am I doing wrong.

There's no such thing as a stupid question around here. ....maybe the answers are questionable at times...lol

 

[69clone]

Haha like they say the only stupid question is the one you don't ask. I may have figured it out following holleys guide.

Alright the front float is getting there about 3/4 full. The rear float is still overfilling and it's not spraying out of the top now but when I kill it, it's running out of the rear jets and dripping out of the vacuum secondary piece. Do I keep turning it clockwise?

 

[Darthomas]

I am happy to admit that here's one topic I know absolutely nothing about and I will shut up and learn.
I accept 1 bbl Holleys on my slantys, but I love my Carters and won't switch, ever.

 

[kiwigtx]

I'm no expert, but from my limited experience the adjustment is much the same as a Holley. I have a QF780, but it's been a while, and I'm an Electrician, so my memory wanders off elsewhere at times....

 

[69clone]

I don't have any real experience either I just kind of winged it with my last carb on the 318 but this is more complex than the 3 little adjustment screws that thing had. The quickfuel instructions that came with the carb were not much help basically all it said was use 5/8" wrench to adjust floats. Luckily Holley had more information that was useful lol... But I think I have found the issue Holley said to turn the nut half a turn to lower it while I wound up turning the back one about 3 complete turns... I found my fuel pressure gauge and installed it at the T. I had someone watch it while I started the engine it instantly pinged to the max past 15psi... So I take it I need a fuel regulator? To bring that down to like 6.5psi? I guess the stock 5/16 stock fuel lines kept up with the AN lines better than I thought...

 

[kiwigtx]

I don't have any real experience either I just kind of winged it with my last carb on the 318 but this is more complex than the 3 little adjustment screws that thing had. The quickfuel instructions that came with the carb were not much help basically all it said was use 5/8" wrench to adjust floats. Luckily Holley had more information that was useful lol... But I think I have found the issue Holley said to turn the nut half a turn to lower it while I wound up turning the back one about 3 complete turns... I found my fuel pressure gauge and installed it at the T. I had someone watch it while I started the engine it instantly pinged to the max past 15psi... So I take it I need a fuel regulator? To bring that down to like 6.5psi? I guess the stock 5/16 stock fuel lines kept up with the AN lines better than I thought...

The great thing about a QF carb, is the clear bowl sights - so you can see the fuel level without pitching gas all over the engine while adjusting the floats. Small adjustments either way to start, and you'll get the hang of it.

 

[mentor70]

i recently put a QF carb on my neighbors car, out of the box the floats looked too high to me, i called the QF teck line and they told me to adjust them so that fuel was in the middle of the sight glass. i could not ever get the adjustment correct. it was as if there was not enough threads on the needle and seat to get it in the right spot, if i got it close to the end of the threads, it would just leak. i serious think there is issues with the carburetor quality control. the other problem i had with it was that even after i had the idle screws turned in all the way, it would still run perfectly smooth. my neighbor got tired of me dicking with it, and he has been driving it a few times a week, no issues that hes complaining about. but i know its not right. i have heard a lot of good things about QF, but its starting to look like hype or just luck.

be prepared to send it back...or send it to a carb guy to iron it out

 

[Bigal75]

Yeah 15psi is way to much. Get your fuel pressure under control and then you'll be able to adjust the fuel level correctly. If fuel keeps coming out of the bowl vent then I would take the needle and seat apart and see if there's some dirt in there.

 

[Bigal75]

And you can set your fuel level on the bench. Take the bowls off, and you can clearance the the float to bowl ceiling with a 7/16 drill bit. Flip the bowl upside down and slide the bit in between the the bowl and float. Adjust the the height.

 

[747mopar]

When I read the O.P. that's the first thing I thought (high pressure). There's not alot to them, you basically just have a float that pushes a needle into the seat closing off the fuel just like a valve would. When your adjusting the nut your just changing the position of the needle and seat in relation to the float altering the height that it shuts the fuel off. High pressure will overcome the needle and seats ability to seal which is where you loose control of the float level.

I always buy pumps designed for carbureted motors so there's no need for a regulator (my Holley pump put out 5.5 psi). I noticed you said you "lowered the pressure" in the original post, keep in mind all your doing while adjusting the float it's changing the level nothing more.

I think you'll find things much easier once you get the pressure sorted out.

 

[rrTor-Red]

I'm sure this is a stupid question but what am I doing wrong. The sights are completely full. I turned the screw alittle and loosen the nut and the fuel level started to drop and stayed in the middle so I left the nut at that position and tightened the screw down. Started it up and fuel shot up about a foot through the chimney? Picture of what I'm talking about. I shut it off and the floats are full again. So I take it I raised the pressure not lowered it. I assume I need to tighten both the nut and screw more clockwise? I was going to install my fuel gauge but I'm afraid if that happens again gas might get on the headers or something...

View attachment 345600

. Starts at roughly 6:39

 

[69clone]

Thanks, yes I didn't realize the mechanical pump that is on there was so powerful. I believe it's a race pump 1500 or 2000 (was on the engine when I bought it) I figured my stock 5/16" lines wouldn't pull so much regardless what pump it had... Anyways, I'm trying to figure out how to setup the regulator and a return line before i play with it anymore.

 

[rrTor-Red]

Have the QF carb as in the video. Attached is a pix of my engine but carb isn't on yet. Uh, work in progress.

I'm kinda in the same boat. Fuel pump has a AN fitting on it for the fuel feed (going to pump) from 5/16" hard line. Need to figure out how to accomplish this. My builder put the AN fitting on the pump and have a braided line going from pump to my QF carb.

 

[69clone]

Have the QF carb as in the video. Attached is a pix of my engine but carb isn't on yet. Uh, work in progress.

I'm kinda in the same boat. Fuel pump has a AN fitting on it for the fuel feed (going to pump) from 5/16" hard line. Need to figure out how to accomplish this. My builder put the AN fitting on the pump and have a braided line going from pump to my QF carb.

View attachment 346470

I had the same problem. It's not right but my temp fix right now was removed the AN fitting on the IN side and installed the slip on kind for a rubber hose. Put a 3/8" hose on it and then I used my fuel filter as the reducer 5/16" hose on one side and the 3/8" on the other side.

 

[747mopar]

And you can set your fuel level on the bench. Take the bowls off, and you can clearance the the float to bowl ceiling with a 7/16 drill bit. Flip the bowl upside down and slide the bit in between the the bowl and float. Adjust the the height.

Have the QF carb as in the video. Attached is a pix of my engine but carb isn't on yet. Uh, work in progress.

I'm kinda in the same boat. Fuel pump has a AN fitting on it for the fuel feed (going to pump) from 5/16" hard line. Need to figure out how to accomplish this. My builder put the AN fitting on the pump and have a braided line going from pump to my QF carb.

View attachment 346470

You can buy a compression fitting that will adapt the fuel line to an AN fitting. I have an adapter on my 3/8" fuel line for an AN fitting then a braided hose to the pump. Check Summit they have them.

 

[747mopar]

Thanks, yes I didn't realize the mechanical pump that is on there was so powerful. I believe it's a race pump 1500 or 2000 (was on the engine when I bought it) I figured my stock 5/16" lines wouldn't pull so much regardless what pump it had... Anyways, I'm trying to figure out how to setup the regulator and a return line before i play with it anymore.

It would likely be easier and cheaper to just throw a low psi pump on it? My Carter cost $75.00, no return line and no regulator.

 

[rrTor-Red]

You can buy a compression fitting that will adapt the fuel line to an AN fitting. I have an adapter on my 3/8" fuel line for an AN fitting then a braided hose to the pump. Check Summit they have them.

Would you have a picture of this? I'm going to check out Summit as well.

 

[747mopar]

 

[hangn0ut]

My advice would be KISS. You know,keep it simple. Like 747 mopar says,go with a stock low pressure pump. The fun your having now is nothing compared to the joy of running a return line back to the tank.