Holley 4150 & 4160 Carburetor

Holley 4150 Carburetor Manual
Holley 4150C Carburetor Rebuild Manual
Holley 4150EG Carburetor Manual
Holley 4150EG Governor Manual
Holley 4150G Carburetor Manual

Other Free Holley Manuals

Application Carburetor Number (list)
1957 Ford Truck 1214
1959 Ford Truck 4150G 1855, 1856, 1857, B9TE,
1968-69 Chevrolet & Ford 4053, 4054, 3917, 4166, 4296, 4346, C80F-C, C8AF,
C70F, C90F, C9AF

 

Fuel Bowl Pump Diaphragm (proper installation)

Before replacing the pump diaphragm cover, check for warpage by laying the cover on a sheet of emery paper which should be on a smooth surface. Remove the sealing bead, if any is present.

Place the diaphragm assembly on the cover, holding the pump lever arm against the diaphragm so that the diaphragm is flat. Don’t forget to install the spring into the bowl first. Install the cover and diaphragm on the fuel bowl and insert the screws finger tight. Release the lever, making certain the diaphragm is loose enough to flex without wrinkling at the edges, also the diaphragm must be able to be raised so that the flange of the steel diaphragm washer touches the inner surface of the cover. These two checks will assure maximum diaphragm travel. Tighten the four screws in two stages, 1/2 torque the first time and full torque on the final stage (5-8 lb. torque).

Recent Posts

Carburetor Percolation

Percolation can happen when your engine gets hot, then you turn the engine off and the fuel boils over, sometimes over the top of the carburetor, or more often, simply evaporates. Back in the day we called this vapor lock, which simply meant that the fuel turned to vapor before getting to the engine.

This has been a more common problem these days because our gas has a lower boiling point than it used to. Yup you guessed it, ethanol.

This makes it hard to start the next time. You have to crank and crank, or pour a bit of gas down the carburetor to get the engine started.
What can you do:
  • One of the best ways, but a lot of work, is to run a 3rd line from the fuel pump back to the gas tank. This extra line will help cool the fuel, allowing the fuel pump to pump gas instead of vapor. There are some fuel filters out there that include a return port. There are also return regulators available.
  • Put heat wrap around the fuel line in the engine compartment.
  • Put a spacer under the carburetor mount. These are hard to find so you will probably have to make one. Yup, a mill would be handy about now. And you will probably need to put longer studs in the manifold to accommodate the extra height.
  • Instead of a spacer add extra mounting gaskets. A couple of 1/32 thick gaskets isn’t going to do much. Hopefully thicker gaskets will be available for your engine.
  • Add a helper electric fuel pump. Just before startup, you run the electric pump for a few seconds, then turn it off. Use only a low pressure pump. 7 lbs max. You may end up also adding a regulator because you don’t want the pump to overrun your mechanical pump. Most 1 & 2 bbl carburetor run 4-4.5 lbs. Bigger carburetors might handle 5-6 lbs.
  • Cool the engine with a cooler thermostat, bigger fan, or bigger radiator.
  • Try different brands of gas. Different octanes won’t help you here.
  • Use non ethanol gas if you can find it.
  • Remember when we used to put wooden clothes pins on the fuel line? The clothes pins act like a heat sync, drawing heat away from the fuel line and my wife says the wooden clothes pins are still available at the dollar store.
Anyhow, the basic answer here is to cool your engine and/or fuel.




  1. How a Choke Works Integral Type 5 Replies
  2. Motorcraft 4300 Power Piston 1 Reply
  3. Gas Tank Fuel Gauge Leave a reply
  4. Tips on Removing Frozen Parts Leave a reply
  5. Stromberg WW Worn Throttle Shafts Leave a reply
  6. Late to the Electric Party Leave a reply
  7. O2 Sensors – Engine Performance from a Capsule Leave a reply
  8. What Kind of Fuel Mileage Can We Expect Leave a reply
  9. Injector Types Leave a reply