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holley [G838 Wiki]
 

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holley 2013/10/26 05:33 current
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 +{{http://www.surfacezero.com/g503/data/942/Holley.JPG}}
 +===History===
 +----
 +The Holley was used on M151 and maybe early M151A1s.
 +  *Holley part number HOLLEY-R-1345-1A
 +  *Army part number ORD 7017440
 +
 +
 +===Replacing a Zenith with a Holley===
 +----
 +The Holley will bolt in exactly like the Zenith. For a M151 or a M151A1 you will not have to change anything.
 +For a M151A2 there is one small difference. The Zenith used in 151A2s has a fuel return line from the carburetor to the fuel tank on the left side of the vehicle. The Holley does not have this fuel return line but needs a vent line to the air cleaner.
 +
 +===Possible Issue when changing to a Holley===
 +----
 +If an Holley is used in a M151A2, it will be connected to the mechanical fuel pump, however it was designed to be used with the electrical in-tank pump of the M151 and M151A1. The pressure of the mechanical fuel pump might be too high for the float valve and the carb might flood. In addition it has been reported that after shutting off a hot engine the fuel pressure remaining in the system can flood the carb. Solution can be to design a restricted return line as used in the Zenith configuration.
 +
 +===Getting a Holley===
 +----
 +It seems to be the case that no NOS or rebuild Holleys are available. Furthermore the only kits available from the common base of M151 part dealerships are the gasket kits only. So when buying a Holley it is very important that the carburetor is complete and all the jets are in place. Before buying a Holley, open the bowl compartment and check for the amount of corrosion.
 +Expect to pay up to USD250 for a Holley in fair condition
 +
 +===Importance of brass angle fitting===
 +----
 +For both the Holley and the Zenith always use the brass fitting between carburetor and fuel filter. Check the picture of the Holley carb. The fuel filter has a conical threads. Screwing in the filter directly in the carburetor body will easily crack the carburetor. The brass fitting however has normal threads towards the carb and uses a special sealing washer and will withstand the conical threads of the metal fuel filter.
 +
 +===Recommendation Fuel Filter===
 +----
 +It is recommended to use a clear plastic fuel filter in front of the original metal filter. The modern type plastic filter will not only have a much better filter effect but most important it is immediatly possible to check if any excess material like sand or rust is present in the fuel tank. Make sure you use a high quality filter out of durable plastic and install so the filter will not stressed by any excessive loads. Remember the filter is on the pressure side and close to the hot exhaust manifold.
 
holley.txt · Last modified: 2013/10/26 05:33 (external edit)
 
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