Inline fuel pump on a M151A2

[Litz]

Hello,

Would there be any problems created if I replaced my mechanical fuel pump with a 24 volt inline fuel pump on a M151A2?

Thanks,
Robin

[m3a1]

I don't think so. A pump is a pump is a pump. Important that you be aware of your carb's correct operating pressure and ensure the pump you choose matches that as closely as possible.

That said, be aware there are mechanical civilian pumps that will bolt right up and do the job for you for WAY less money.

[rickf]

You can use an electric pump but the Zenith carb will start to have issues with pressure over 5lb. max. Even at 5lbs. which is the top specified limit I have seen a lot of flooding issues and have had to lower float levels to the point where high speed performance was affected.

[Horst]

sorry to ask, but why?

The mechanical fuel pump is very reliable and almost never a problem. Also easy to overhaul if there is an issue. Glad I have that one and not the electrical pump on my jeep.

[Hambone]

Hello,

Would there be any problems created if I replaced my mechanical fuel pump with a 24 volt inline fuel pump on a M151A2?

Thanks,
Robin

You can have your mechanical pump rebuilt with modern material for $100, way more reliable than the modern electric or you can buy an aftermarket mechanical from an old Dodge slant 6 for $30.

[rickf]

When was the last time you priced one of those slant six pumps?!! They are like the water pumps, they have dried up.

[Hambone]

When was the last time you priced one of those slant six pumps?!! They are like the water pumps, they have dried up.

They've definitly jumped in price, but can still be had for $45.
https://www.carid.com/airtex/mechanical ... odEALw_wcB

[Litz]

I am going to get my mechanical pump rebuilt.
Thanks for the feedback.

[hondo100]

I've used Terrill Machine, Inc of DeLeon TX for years. Last rebuild with modern materials was ~$100.

RG

[johnsamschulz]

From: Felzt Terrill <terrillmachine@yahoo.com>
Sent: Monday, August 25, 2025 8:13 PM
To: Schulz, John H
Subject: Re: M151 fuel pump rebuild - [UNCLASSIFIED]

John,
We Can Rebuild The Military M151 Fuel Pumps. We Put The Modern Type Materials In It That Will Hold Up To Today's Gas. It Comes Back With A Mounting Gasket & 1 Year Warranty On It. I Believe This Is A Double Action Pump With A Primer Handle On It. So They Are $160.00 Plus Return Shipping. Once We Have The Pump It Takes About 4-5 Weeks To Rebuild It. If You Do Decide To Send It To Us Please Include The Primer Handle & All The Brackets & Parts That Hold It In.
Thank You,
Feltz Terrill Jr. Terrill Machine 1000 CR 454, De Leon, TX 76444 PH 254-893-2610 FAX 254-893-4841 terrillmachine@yahoo.com

[rickf]

Pretty pricey. I am not sure what Then and Now is charging nowadays. The fact that they ask for the priming handle makes me wonder if they know what pump you are talking about? There is no primer on a M-151 pump.

[glcaines]

I can't remember exactly what I paid, but I had Then and Now rebuild my A2 fuel pump several months back. I do remember that the cost was very reasonable, they used new parts compatible with ethanol fuel and it looked absolutely like new when I received it back. No problems with the rebuilt fuel pump. They even returned the removed internal components, which looked horrible. I would highly recommend Then and Now.

[csmith]

I have used Then & Now within the past year, good results, tried to buy rebuild kits but they did not seem to want to sell them.

I can't remember exactly what I paid, but I had Then and Now rebuild my A2 fuel pump several months back. I do remember that the cost was very reasonable, they used new parts compatible with ethanol fuel and it looked absolutely like new when I received it back. No problems with the rebuilt fuel pump. They even returned the removed internal components, which looked horrible. I would highly recommend Then and Now.