sen2two

iTrader: (10)

Has power. Good ground. I hear it click, but does nothing.

Does anyone here know if there is some type of relay or fuse internally that can be replaced? The fuel pump is pretty new so I don't know why it would do this.

Qingdao

iTrader: (3)

There isn't any internal fuse or anything. The pump comes apart rather easy, and diagnosis is a cake walk from there. Its a stupid simple pump. Three brushes.... that's it. When I got mine the pinfor the pos connection was unattached.


Make sure if you are using a return style regulator you take out the internal spring thing in the bottom of the pump.

sen2two

iTrader: (10)

I removed the spring and dropped in that little brass plug in its place. Was there anything else in there besides the spring? I didn't see anything.

I have the return style Mallory 4309 regulator.

sen2two

iTrader: (10)

I removed the top of the pump. Both the power and the ground wire are firmly connected and look new still. I tried to turn the pump motor by hand, and it will not. Is it supposed to?

Qingdao

iTrader: (3)

Same regulator I'm using on my turbo car. Are you boosting your car?

Mine had the spring a little plug looking thing in it. I just took it all out and put the plug in it.

The 140 is LOUD. When it works you'll know it. It sounds like a 12VDC drill.

Qingdao

iTrader: (3)

I mean check the connections inside the pump. There are two screws that hold the top together. If you take the top off you can see the bearings and brushes. If the pump won't move at all. you might have a seized bearing. You can source new bearings. They are just small ball bearings.

Qingdao

iTrader: (3)

https://www.rx7club.com/attachments/...526_164502.jpg


^^^Link to a pic of the inside of the pump.

sen2two

iTrader: (10)

That's what I did. Everything looked good. I can hear a click when I give it power. Don't know how it would sieze though. I've never even ran it... but that looks to be the only answer.

Qingdao

iTrader: (3)

Are the brushes nice and thick? Armature nice and smooth? Are the stationary magnets still glued to there housings?

The armature should spin freely when it is disassembled like in the picture. If you put the housing back on top and try to spin it and it becomes stubborn then check the housing for obstructions. The magnets glued to the housings will make the armature harder to spin, but not impossible.

Are you sure the bushings are in place with the plate sealing the housing to the rest of the pump? I really don't like putting bushings back in. I REALLY don't enjoy that process. If a bushing jumped out during reassembly it could make a clicking sound when the bushings get energy and when they are turned off they relax.


One more thing... you could have a dirty motor. Dust and other contaminants can cause the motor to foul up. Make sure the motor is nice and clean inside






EDIT: oh. I did oil the drive gearing on the bottom before reassembly of the pump itself. The drive gear needs lube in order to move freely. To check this remove the pump portion and see if the motor will turn the little "keyway" or chuck looking shaft at the bottom. If it spins when the motor is energized then there is your problem.

^^^IIRC this pump did seize up on me when I first got mine. I bought mine second hand.

sen2two

iTrader: (10)

After I wrote my last post, I went back and disassembled the pump as far as it could go. The was some surface rust on the gear and it seemed it was stuck in place. I filled the cavity up with PB Blaster and I'm letting it sit overnight. I will see if I can remove the gear tomorrow and I will remove all the surface rust with scotch-brite and then clean thoroughly. I'm hoping this will remedy the problem.

Even though it's new, I did sit on my garage for well over a year. I guess that's long enough without use to seize the gear up to the gear housing.

Qingdao

iTrader: (3)

I got mine second hand, and the wires to the brushes inside the pump were un-plugged. and I think I might have had a problem with the seizing of the pump gearing too. I did have an issue (largely due to my own incompetence) with the built in regulator. Every time I would put the damn thing on it developed one of the for mentioned problems. I about gave up on the thing, but since I figured out all of the issues its been a really great pump. A little bit on the loud side, but I can floor the car through all of the gears and NEVER run out of fuel. It also makes the PERFECT amount of fuel pressure for the Nikki carb.


And if ever I need to transfer a tank of fuel it pumps over 2 gallons a minute

sen2two

iTrader: (10)

So after soaking in PB Blaster for 24 hours, it still would not budge. Even hitting it with a hammer and punch did nothing. So I put the aluminum base in the vice to keep it still. Then wrapped a rag around the motor. While spraying WD40 and attempting to turn the motor by hand, I noticed it started to kind of budge. So I kept at it while turning with everything I had. It eventually broke loose but was still VERY rough. I kept adding WD40 and rotating until it was turning OK. I then removed the gear and the ring it rotates with. The othere side was very rusty. I cleaned everything up until it looked like new. After reinstalling the cleaned gears, everything spun freely. Yay!

Then when I was at the last part of reassembly, I noticed one of the little square brass pieces that contacts the motor (don't know the name) has broken in half! Come on!

Is this a part I can order? or find at somewhere like radio shack?

After all that, I don't want to give up on this pump. It's the principal! Lol...

Qingdao

iTrader: (3)

http://bass.gmu.edu/~pceperle/WebPro...otor_drill.jpg


Did you break the brass holder for one of the brushes? or just the brush itself. The brushes can be replaced Mallory sells new replacement parts. The brush holder (I guess that's the name ) is a different story. I guess you'll have to source a new top piece for the 140. Maybe a racing supply store would have an old one lying around? These pumps are super common in big v8s so I guess a big muscle car shop might have extra parts.

sen2two

iTrader: (10)

One of the brushes broke in half. I'm was going to machine down a piece of copper to get it done quickly.

But I did find the replacement parts needed.

Mallory Fuel Pump Service Part Kits 29939 - Free Shipping on Orders Over $99 at Summit Racing