And yet more issues

[Guest tony78_280z]

Car still sputters at take off and when I get it to a good speed (say 35 to 40mph) it surges real bad (enough to make me and my test dummy / co-pilot rock back and forth). So my book tells me the Car is prolly got a fuel restriction.

1. Dirt in tank or lines? (nope shined with POR15 Tank kit)

2. Float too low? Quadrajunk is not adjustable. Maybe a bad Carb.

3. Jets too loose or wrong size? (see 2. above)

4. Power sys in Carb broke? (see 2. again)

5. Vacuum leak? Nah, don't think so

6. Fuel pressure regulator set to lean. Maybe but if I rais it then the carb floods the motor out and it runs like major crap. (see 2. yet again)

 

So,.. I'm gonna repair the Holley (again) and put it back in (again). In the mean time anybody got any other Idears to try.

 

Oh ya what is the best way to find out where the smell of burnt plastic is coming from?

 

-Tony

 

I have a dream that One day, I too, will own a car that runs.

[Pyro]

Sounds like you are just having carb problems. But connect the vaccum advance to the right port anyways.

 

Surging when driving at a constant speed is a sign of running lean.

 

The fuel float is adjustable in a quadajet but you need to take off the top of the carb. And the quadajet is a very good carb when working correctly. So is the Holley. Both the holley and Q-jet are very dependable and durable. IMHO, the Q-jet will get better gas mileage if driven slow but worst when driven fast as compared to a holley. But don't ever buy a cheapo carter/edelbrock carb.

 

With the engine off, pump the carb linkage and see if fuel is pumping out of the accelerator pump.

 

Check for vacuum leaks. Use a propane torch without the flame lit. Vent the gas around the intake manifold and carb. The engine will run rough when it eats propane.

 

If you are going to buy a new carb, get a holley 3310, 750 vac secondary.

 

What kind of a regualtor and pump are you using? The Q-jet and holley can handle 7 psi with any problems. Most aftermarket pumps for carbed engines make 7psi and would not require a regulator.

[Guest tony78_280z]

I THINK I got the advance at the right place. Not sure on the Quad though. I don't have a diagram. Fuel does pump out of the accellerator pump, but not alot. Not as much as the holley. And the lever of the pump, I saw gas come out of there once. I'm sure it's not right.

 

I don't have faith enough in myself to take the top off of my Carb. I'd rather just toss it and run the holley anyway.

 

"Check for vacuum leaks. Use a propane torch without the flame lit. Vent the gas around the intake manifold and carb. The engine will run rough when it eats propane." -- Interesting never thought of that one. Pretty sure there are no vacuum leaks though.

 

750cfm... too big. I'm running a stock motor here. And I don't plan on doing too much to it. 600cfm is plenty for me, for now.

 

Umm --> "Holley Pressure Regulator with an Electric Fuel Pump" The regulator should put between 1 and 6psi as advertised. The pump is quality, tough, but dumb. I'm not sure how much psi it pumps.

 

Thanks

 

-T

[COZY Z COLE]

Here's my 2 cents...... HOLLEY carbs like 5 to 7 psi. You need to find out what the psi is at after the fuel regulator. 6 psi is ideal. under 3psi shut the engine off. Over 7psi and the carb becomes prone to flooding. Put a fuel pressure guage in the engine compartment, in the dash, or mounted outside. You need to know first what the fuel regulator is doing before messing with the carb. I know this from experience because I went thru 3, new out of the box, fuel regulators that danced the psi all over the place. Keep in mind that when using a fuel pressure guage it can move up and down in small degrees but with wild swings, check that regulator. You said yours was rated at 1 to 6 psi, believe me it can swing into the teens when it is defective.

 

LARRY