1972 Float Adjustment ...

[jalexquijano]

You guys wanted me to adjust to 2.5 turns clockwise on a 240z modified engine? SM needles, Schneider 274F Camshaft and pertronix ignition?

[240260280]

39 minutes ago, jalexquijano said:

so 3.5 to 4 turns will be okay? in the past the former airtex 8012s fuel i had installed measured 4.2 psi and i could dial it at 2.75 to 3 turns clockwise. Maybe in the end the car does not need the 4.2 psi and will run okay with 3 psi but i will need to open the carbs more.

If you increase or decrease the fuel pressure, it is possible the fuel height will change and mess things up.

If you are between 2.5psi and 4psi you are good.  Set it once then leave it.  Then adjust the fuel level using the float tang.

For the most part, fuel pressure will only only determine how fast the bowls refill. It must not be too high so as to overpower the float's buoyancy pressure.  It is not something you need to play with. 

The stock fuel pressure is ~3.4 psi.

 

[jalexquijano]

2 hours ago, 240260280 said:

If you increase or decrease the fuel pressure, it is possible the fuel height will change and mess things up.

If you are between 2.5psi and 4psi you are good.  Set it once then leave it.  Then adjust the fuel level using the float tang.

For the most part, fuel pressure will only only determine how fast the bowls refill. It must not be too high so as to overpower the float's buoyancy pressure.  It is not something you need to play with. 

The stock fuel pressure is ~3.4 psi.

 

 

[240260280]

That looks perfect!  No need to adjust fuel pressure.

[jalexquijano]

What else should i keep adjusting? Narrowing the gap between both floats more?

[240260280]

It is impossible to tell by looking at the lids.  You have to look at the fuel height in the fuel bowl.

 

Do this:

1. Draw line at 20mm or 23mm down.

2. Put measurement hose against the line.

2. Adjust tang until fuel level matches line on each bowl.

3. Done

[jalexquijano]

Ok

[siteunseen]

I agree with 240260280, you should completely forget about doing adjusting with the lids and float upside down.

[jalexquijano]

7 hours ago, 240260280 said:

It is impossible to tell by looking at the lids.  You have to look at the fuel height in the fuel bowl.

 

Do this:

1. Draw line at 20mm or 23mm down.

2. Put measurement hose against the line.

2. Adjust tang until fuel level matches line on each bowl.

3. Done

Rear float and front float fuel levels after minimum bending of the tang.

[240260280]

Route the hose next to the float bowl so that it presses against the line, you will be more accurate that way.

[jalexquijano]

3.70 turns clockwise spark plugs number 2 and 5

[Mark Maras]

 What do the other plugs look like and how did the car run?