Help: Mechanical fuel pump

So my stock 230 quit running. Found that fuel was no longer being pumped to the engine. Removed the civi 6510 pump and sent it to Then-And-Now to be rebuilt. Pump came back looking better than new. Installed.

Now the fun part .... what the hell is the magic to get this thing to pump? I literally have the intake hose going from a gas can straight to the pump. I sucked gas all the way through to the glass filter at the carb. I primed the carb through the bowl stack. Runs only as long as the fuel in the carb then dies. I can see from the clear line I put in the gas can the pump isn't pumping. I also verified the pump cam is going up and down in the engine.

IT JUST WON'T PUMP FUEL. What am I doing wrong????

Also anyone have a part # for an electric pump that works for th stock 230?

I always test the pump by running a clean can of fuel to the input and the output line empties into a empty water bottle. crank the engine and fuel should pump into the bottle.

from your description it sounds like the pump isn't getting primed. Might try filling the suction line with fuel before connecting to the pump.

I usually strap my fuel can to the bumper. If it is on the ground you might not have enough to pull the fuel through the line. If you have any air leaks in the suction line that will also keep fuel from flowing.

Just my $0.02.

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Originally Posted by kwai

... If you have any air leaks in the suction line that will also keep fuel from flowing.

...

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Good suggestion, you might try that. Air is thinner than gas (Yes, I know you knew that ;) ) and that pump will suck air faster than fuel.

Worse case scenario, try working the pump manually by hand.

My problem persists.

- I used a mighty-vac to pull the fuel to the filter by the carb. So no obstruction.
- I also confirmed the pump works. Took it off and pumped by hand and gas shot all over me! LOL.
- I confirmed the dowel like rod in the engine that pushes the manual pump lever is moving in and out when the engine is turned over.

One thing I did notice is that when I pull the fuel to the carb it doesn't stay at level .. it drains back down the system. There also does seem to be a lot of air when the Mighty-vac pulls. But I've been through the whole system. SS tank -> SS line all the way to the pump. Only place I can think would be the SS flex line at the frame motor transition.

I test the fuel pump using a 5 gal can affixed to the bumper with a fuel line going to the inlet to the fuel pump. Disconnect the fuel pump outlet at the fuel filter and run the fuel into a water bottle. crank the engine. once fuel is pumping it should fill the bottle in about 10 to 15 seconds of cranking.

Thanks for all that offered help. Mystery finally resolved.

- Original Fuel pump = BAD
- Ebay Rebuilt Fuel Pump = BAD
- Then & Now Original Fuel Pump Rebuild = BAD!!!! :mad::mad::mad:

- Brand new Fuel Pump sitting on shelf in well house = GOOD!!!!

Long story short I have so many parts I didn't know I had a new fuel pump. I buy parts when I see them. It was brand new in the box, gasket, paperwork and all. Hooked up the intake side, pumped by hand three times and POW out shot gas.

So I now have two broken civilian fuel pumps that needs rebuilding, not counting the Original Military one .... very disappointed in Then & Now. I assume this is an aberration. Complete SS fuel system from Tank to Carb including SS flex line at the frame motor transition. I better NEVER have a fuel delivery problem again! LOL

Wow...that sucks about Then and Now...any contact with them to see if they will do anything about compensation for that?

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Originally Posted by brute4c

Wow...that sucks about Then and Now...any contact with them to see if they will do anything about compensation for that?

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Hope it hasn't been a long time, but I would try it. Rubber parts can dry out if not kept sealed up.

I bought one of Then and Now's rebuild kits about three years ago, and did the rebuild on my military pump myself back then. I would highly recommend their kits to anyone.

To all: Next time try Authur Gould Rebuilders in Kings Park, New York. They did my fuel pump and my water pump. Here is their website: http://arthurgouldrebuilders.com/

And no, they didn't break my water pump pulley. They did a perfect job.

I may have spoken too soon. So the pump works I confirmed that by manually pumping it. When I put it on the truck ... it does not work. I'm am almost certain now there is something wrong inside the timing chain cover that pushes the pump arm up and down.

I looked at the manual and could not find a diagram that showed the parts that operate the fuel pump arm. Can anyone point we to that. Or better yet does anyone know what that looks like if you look up in the cavity the arm is supposed to go in. A pic would be GREAT! When I do that all I see is a round dowel thing that goes in and out. I think something may have broken off the end of that. I don't think it is reaching the pump arm.

NEVERMIND ...... ITS ALIVE!!!! Tolerances must be pretty tight .. Found and old gasket on the water pump that I could tell was there. Two gaskets don't allow for pump arm contact. One gasket = starts right up!!!!

On page 49 of the '34P manual it is part #5, "fuel pump eccentric". That drives the fuel pump lever up and down. I have a new one in my collection of parts.

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Originally Posted by teking

NEVERMIND ...... ITS ALIVE!!!! Tolerances must be pretty tight .. Found and old gasket on the water pump that I could tell was there. Two gaskets don't allow for pump arm contact. One gasket = starts right up!!!!

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Amazing...thats a new one on me! Thanks for posting it...would have not even thought of it.

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Originally Posted by rboltz

On page 49 of the '34P manual it is part #5, "fuel pump eccentric". That drives the fuel pump lever up and down. I have a new one in my collection of parts.

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I figured out why I couldn't find it ..... 34P in the links at the top of the page are missing pages between 37 and 54!!!!

I will look into this right now...thanks for letting me know!!

The 34P manual, which is the parts manual...all the pages are there as far as I see.
I do see that in the index listing, it has the page numbers go from page 10 to page 38 in the table of contents listing...which is probably what the actual pages in the book are listed as because the book has the beginning of a chapter, in this case the first chapter is engine, so the book has all the images one after the other on unnumbered pages, then the tables that show all the parts listed with the page numbers shown in the table.
When I made the tables pages themselves, I numbered them all starting at 11 and going up as I needed to do something to keep track of them for my own accounting and the last page number of the previous section was 10...maybe its confusing but all the pages are there.

The image he is referring to is image 16 in the engine section, Timing Chain and Gears, and is #5 as he said...heres the image:

http://www.m715zone.com/vb/pages/manuals/34p/fig16.jpg

Would you be willing to sell the military fuel pump it's the only thing I'm missing.?

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Originally Posted by Corypheaus

Would you be willing to sell the military fuel pump it's the only thing I'm missing.?

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Unfortunately no ..... i am sending it out to be rebuilt. Sorry!


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Solved my fuel delivery problem. Did it the pizz poor expensive way because I got tired of d--kn' around with it. Installed a new SS tank, blew out the SS lines, installed a rebuilt fuel pump, installed a rebuilt carb and new fuel filter.

Cranks right up and runs awesome. Never did find out what the problem was. I suspect it was many ... in many different locations. Guess I know now what my time is worth. :mad:

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Originally Posted by teking

Solved my fuel delivery problem. Did it the pizz poor expensive way because I got tired of d--kn' around with it. Installed a new SS tank, blew out the SS lines, installed a rebuilt fuel pump, installed a rebuilt carb and new fuel filter.

Cranks right up and runs awesome. Never did find out what the problem was. I suspect it was many ... in many different locations. Guess I know now what my time is worth. :mad:

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Except for the new fuel pump, that is what I did from the get-go. It is usually a never ending battle once rust has taken over.

Good on ya!