The Stovebolt Site Forums The Shop Area Engine Shop 6 Cyl. I.D. help needed.

Hey guys, Trying to I.D. the engine in my '53 6400 dump (in gallery-Rick Schiltz '53 6400 dump).
Here's the Eng. # next to the dist:
SO627A
As far As I can tell, it means June 27th. Does the "A" designate a 3600 ?
Date code;
F252
As far As I gather June 25th,1962.

How do I tell displacement?

The problem I'm having is it seems it has the wrong fuel pump. The gas only trickles into the clear filter, I can't believe it runs at all.

Thanks for the help guys!

topcat,

I don't know the info on the numbers, but will say, I think the fuel pumps for the old 6's are pretty generic.

Here are a few 'no fuel' ideas; no fuel in the tank, debris plugging tank outlet, swollen and collapsed fuel hose, plugged fuel line, fuel pump on upside down, fuel pump actuator arm not on cam lobe, discharge line plugged, and last but not least....bad fuel pump.

Your post indicates the truck is running. Is there really a problem.

These may sound silly, but all have been reported at some time on this great site. Good luck.

Stuart

Stuart,
Thanks for the reply.
I just went thru the whole fuel system.
*The tank was removed & flushed & painted,
*the hard line to the fuel pump flushed with new gas,
*same with the line to the carb.
*The carb was rebuilt, and a clear filter installed.
That's what clued me in to the problem.
The gas was just dribbling into the filter, not even filling it half way. The carb must be sucking the gas in rather than the pump creating pressure.
So I replaced the pump, with no change.
The motor bogs when you hit the gas-no pump shot.
I think it's just running on the venturies.

The auto supply I.D.'d the pump as a '54-'57 6 cyl pump, my motor is a '62, but I'm told the pump arms will all be the same for the old chevy 6's
I knew something wasn't right when there was no pressure on the fuel pump bolts during the install.
I will try re-installing, but the arm is short, I don't see how I could screw up engaging t he cam.
The general consensus is that the cam is worn.
If that's the case, I'll go with an electric pump.
I was just hoping to keep it original looking.
Rick.

Is the filter on the pressure side of the pump or the suction side? What you are discribing may be a normal condition. I have seen filters on the pressure side of the fuel pump that when the engine was running were not full. I don't know why this happens but if it bugs you, run a fuel pressure test. If it has good pressure and good flow when the line is removed, put a metal filter on it so you cant see the empty filter.

Upps I should have read further TC ---- NEVERMIND!!!!

topcat,

You sure have covered all the bases. I have several rigs at work with the clear filter ahead of the carburetor. None of the filters ever fill more than 1/2 full, yet the engines run fine.

I have always thought there must be a air cushion, or some time of self leveling effect going on. The carburetor cannot suck gas, it must be pumped in by the pump.

The cam lobe could be worn, but the bog on acceleration probably is a tuning issue, or a carburetor adjustment issue. The fuel pump is sort of a 'it works' or 'it doesn't work' kind of deal.

Installing the clear filter might have given rise to a problem that isn't really there.

A easy test would be to pull the discharge line from the pump and see how much fuel it moves.

Stuart

Thanks Stuart,
I think you're right. It may be that seeing the gas became a red herring.

I do get an accelerator shot when I hit the gas.

I have good vacuum, but there could be a leak in the 2 speed rear end system, I'll check that.

I plan on adding an HEI distributor, which also may solve the problem if I'm getting too much gas out of the accelerator pump.

PS. Jim Carter truck parts has some cool stuff. I found a short shaft water pump that'll let me move my radiator back to it's original position


Thanks all.