I can't keep my '51 L-134 running.  I just finished replacing the fuel tank with a steel version from Kaiser-Willys, new fuel pump, new in-line filter, and rebuilt carburetor (W-O) (see attached photo).  Initially, it started up and I got about three miles out of it before it started spitting and acting just like it was running out of gas.

So, tonight I disconnected the fuel line from the carb and pumped gas into a jar.  Plenty of fuel volume from the fuel pump, but the color of the gas is amber (see attached photo).  Could this be some contamination from the new fuel tank? 

Before disconnecting the line, I started the engine and it continued to act like no gas.  With the engine off, I looked down into the carb and pulled the accelerator rod a few times.  I did not see a steady stream of gas going into the carb, but only what looked like a trickle down the inside walls of the carb.  Could it be the accelerator pump is bad in the "rebuilt" carb?

Any ideas?

TomCat,
I can't speak to the amber fuel.  Seems a bit odd.  I got a reproduction tank from Walcks.  I didn't look at the fuel color, but my Willys ran fine with the new tank. Walcks and Kaiser are probably selling the same tanks.

If your fuel delivery is good, then the carb is likely your issue.  If you run the Willys for a bit, then pull the fuel bowl top, is it full of fuel?

If so...

I see rubber fuel lines at your fuel filter.  One possibility is that when you cut them to length, a small piece of rubber ended up in the line.  This may have been pushed into the carb and is slightly blocking one of your jets.

Pull the carb  and the jet covers and blow compressed air through the jets.  This may clear a slight blockage. 

If your fuel bowl is not full, then I would suspect that the blockage is in the fuel filter or fuel line from the fuel pump to the carb. 

My experience with a bad accelerator pump is more of a hesitation issue than a fuel starvation issue.

Just some ideas. 

Let us know what you find.

Good luck.

Tim

It could be the float setting. It should be 3/8", as measured from the inside face of the bowl cover without the gasket in place. It could be a piece of lint or grit in the needle and seat. It could be an accelerator pump swollen from contact with bad gas. I would check all three.

Was it running before you replaced the carb, tank and pump?

You might try a different source of clean fuel..that amber fuel is odd...does it have a different odor?

Here are a few random thoughts and ideas I picked up along the way when I was having fuel issues:

- run a temporary line from a plastic gas can to the fuel pump.  Remove the fuel filter from the line from the pump to the carb.  Start the engine and see what results you get.  If you still have the problem, you have eliminated the gas tank, fuel line to the pump and the fuel filter and are down to the fuel pump or the carb...

-Silly question, but are you sure you have enough gas in the tank?  There is usually a tube that sticks up 2-3" inside the tank where the fuel line attaches.  This is to prevent "stuff" from the bottom of the tank getting sucked into the fuel line. 

-Don't discount the accel pump in the carb just because it is new.  I rebuilt my carb with new parts and less than a year later, my new accel pump swelled up and would not work.  I ended up putting the old one back in.  When you pump the gas pedal, you should see a strong stream of gas getting shot down the throat of the carb.

- the discolored fuel could be from oil inside the lines or tank from when they were produced.  It is not uncommon for new steel lines to have machine oil left in them from production.  If that is it, it should clear up the more the tank and lines are flushed out and used.

-as stated before, you should check your float level and ensure it is set properly at 3/8" WITHOUT the gasket on.

-check your idle mixture adjustment and make sure it is not screwed all the way in preventing enough fuel from getting into the mix.  If I remember correctly, a good starting point is to screw it all the way in, then back it out 1 1/2 turns.

-blow everything out good and make sure a random bit of trash didn't sneak by the filter stop up a jet.

Good luck!

Thanks, Mark and Tim.  The comment about having a strong spray of gas when the gas pedal is pushed has me pretty much convinced it is the carb pump...I don't see any spray.

One other thought, did you use a spacer with that glass top single action pump? I believe these pumps don't use them.

tomcattoy wrote on 06/26/13 at 19:49:06:


I would add some fresh gas, either after draining the onboard tank or from another tank/source, then I would pump the accelerator until my foot was tired, rest a little, do it again, and see if that doesn't clear out whatever seems to be stuck in there..

If that has no effect, then I would start taking things apart...

Be sure to let us know what you find. I have read several of these hesitation threads or threads about poorly running engines..I'm about to put mine back together and would like to avoid having my own problems.... if possible...