Holley 4150 & 4160 Troubleshooting

Why Does my Engine Die After Starting?

Here is a list of possible solutions not in any order.

  • Number 1 problem would be the ignition. Check plugs, wires and distributor.
  • Clogged fuel filter
  • Weak fuel pump. Test the pressure.
  • Is it dying because of too much gas?
    • Look down the carburetor after turning it off. Is any gas dribbling down the venturi. This would mean gas is getting siphoned from the float bowl because of non vented gas cap, carburetor vent(s) plugged off.
    • Float may be bad or out of adjustment. It may be allowing enough fuel at idle but runs out at higher speed.
    • Needle & Seat leaking.
    • Is the choke closing when cold and not opening all the way until warmed up.
  • Is it dying because of not enough gas?
    • Kinked fuel line.
    • Gas tank too low (not likely but have heard of some not working when gas gets too low.
    • Rubber fuel line collapsing because of ethanol damage. You would probably see black particles in the float bowl.
    • Dirty carburetor. Do you see any dirt in the float bowl when removed?
    • Has the car been sitting for months at one point? Gas will turn to varnish and coat the inside of the gas tank and carburetor. Fresh gas will not fix this problem.

Why is my Holley Carburetor Flooding?

  • Leaky needle and seat are the most common. See this page on how to test it
  • Float leaking. Nitrophyl floats are solid but can absorb fuel. Weighing in grams is the only way to test this type.
  • Float sticking. Move the float up and down by hand to see if you can feel any binding.
  • Engines that have been sitting for several months can be a problem. Gas turns into varnish then coats the gas tank and the carburetor. Fresh gas is not the solution.
  • Bad power valve. If the power valve is leaking then extra gas is being transferred to the main circuit. This will usually cause a richness and not necessarily flooding.
  • Dirty or plugged passages. A rebuild may be needed. Blow out every passage, or spray carburetor cleaner through each passage.

My Carburetor Has Idle Mixture Screws On the Secondary Side Only

Idle mixture screws on the secondary’s and not primary is normal on some of the governor carbs, not all, but some.

I Don’t Know Where This Part Goes

Holley 4150 & 4160

Number 37. The 2 holes slip over two pins.

Holley 4150 Exploded View
Updated on 05/19/2021

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