The Stovebolt Site Forums The Shop Area Engine Shop 47-48 fuel pump versus 54 fuel pump.

I believe a 54 motor I acquired probably has a 47 fuel pump in it. I've rebuilt carb-twice-set timing with light and by vac. Gauge. Installed new plugs/wires/cap rotor. vac. advance unit, coil etc-tried 2 condensors. New intake gasket. Set proper dwell. Car idles so nice and revs up in garage-but get on road with a load and it fades bad on power around 35-40MPH Anyone know if 54 pumps deliver more than 47-48 units? That's the one item I think came off my old 47. Catalogs show different model/part no. pumps from different years. Anyone know if volume is different?

Do you have a fuel filter?
If yes, where is it located?

1948 fuel pump: 3-4 psi
1954 fuel pump: 3.5-4.5 psi

Fuel filter is located 5 inches before present fuel pump.

Do you know how clean your fuel tank is?
Might there be sediment partially blocking the output?

I believe one difference in the fuel pumps is the angle of the in/out ports. Early pumps, to 1951 I think, had ports parallel to the block whereas later models did not.

Also check your fuel filter it might have some kind of gooey substance inside.
I had bought a old 48 Willys Jeep and it would run fine up to about 45 mph, then die.
If I backed off the throttle it would start running again.
It turns out instead of using a gasket to seal the Fuel Tank Sending Unit.
They used a silicone sealant.
The gas dissolved the silicone and it ended up in the filter.
It was acting like a governor, restricting fuel flow to the Carburetor.

What happens if you back off the throttle, does power come back?

Do you have the "can't see through" type of fuel filter?
That is the type that I had.
I had to cut into it to see the goo.

I believe all 47-55.1 truck pumps were originally parallel. The angled-port pumps were for cars to avoid interference with the side motor mounts.
At some point some of the aftermarket bean counters must have decided to make them all angled to simplify manufacturing and save money. Not a big deal, since you can easily bend the fuel lines to make them work.
Carl

The old dude at the parts store (the one who can still operate the big fat book) was able to cross and cross and find one set up parallel.

I think I kept the box and will post the part # if I can find it.

JW51,

Thanks for offering to post the brand and part number.

Offer the "old dude" any kind of help he could possibly need to extend his life. I am afraid that he is the last one who is still alive.
We used to have one around here, until the parts store was bought out by a conglomerate who thought that it took too long to look stuff up in the fat books and ordered them to be thrown out. Now it is easier to tell someone looking for parts, "We don't carry that. Next in line?"
Carl

The box is buried if I still have it. My wife uses the bed of my truck (maybe spitefully) as our cardboard recycling area.

But I found the number in an old PM string. Airtex 429. Same part number in Delco.

Long live old dudes and big fat books.

I should probably acquire some big fat parts books before they are all gone.

The old mechanical pumps were all just about the same. Only thing that really changed was is the pump arm was over or under the cam fuel pump lobe. Some had pulsator domes but later ones do not.

I have a big rebuild book and all the specs are just about the same... As mentioned, where it fit on the motor and how the lines were routed were the biggest differences.

The O'reilly's that I go to now still has catalogs. Most of the regular guys know that when I come in they will need a catalog. It is nice to look at a Catalog and see multiple listings and the parts used. I have a 49 with a 235 out of a later model. So Like today when I went to get points it was nice to see that they all used the same points, without have to check multiple computer screens. Sometime Technology isn't better!

Hi Gents, I saw this thread this morning searching for another subject and just wanted to add the current O'reilly's Part number for the standard non glass bowl fuel pump. They no longer stock the "Airtex 429", however they carry "Precision M16114". The pump is obviously made by the same manufacture in Mexico and even had the 429 tag attached. This pump will not show up under our truck year search, I cross referenced the Autozone and Napa part numbers to find it, however its the same pump.