The Stovebolt Site Forums The Shop Area Engine Shop Fuel filter change. 216 46 1/2 ton

I bought the filter and my glass bulb was dirty and I thought the filter was under glass bulb. Is the filter in the bottom of pump. And do you remove the 6 or so screw and bottom comes off and then replace the filter. And if all goes well how long should it take. Truck symptoms are going up a hill it wants to die out. I let off foot feet and it gets gas again. Was hoping a hour to fix but since the filter is not under glass, I have the new filter and gasket from Jim Carter. I see gasket goes under bowl.

Thanks Glen

Looks like I have a nice filter but wrong place. When removing screen mine is tight. Do you keep wiggling back and forth till it comes off
Thanks Glen

Glen - It's hard to tell from your pictures which filter element your pump has. From your second post, it sounds like yours has the "screen" type filter instead of the replaceable paper element.

If it is the screen type, yes to wiggling it till it comes off. Then it will need to be cleaned to restore filter function and flow.

Below is an early pump with glass top filter diagram (not specifically yours but the same design/concept) showing the pump break down.

Dan.

Thanks, That is correct pump. I was able to locate a you tube video. Funny glass was so yellow it had me confused. I thought was like one of my older Farmall tractors. It looks like I have no filter other than screen so it maybe on my wish list

I put it back together to put back in garage. So I can pull it out and finish this part.

I think I I’ll get the screen off and get that all cleaned up. Give it a test run and if it still bogs down I can order a kit to rebuild it. A couple of videos on You Tube show the rebuild that looks fairly simple. Then I should add an in line filter also.
Glen

Well I worked the screen loose. Was a little rusted to pump. Cleaned the screen, top of pump(just a bit of crud in there), and the glass bowl, then put it together and guess what? The gasket leaked, turned it over and still leaked. Oh well a new gasket on order.

I can't tell if the old gasket is cork or rubber but cork is the best for those glass covers. Rubber ones leak.

Thanks. It is cork. Fortunately my local auto store can get one in a day and no shipping. The old one was leaking a small amt before I took it apart but I’m taking your advice from others posts and send pump to Then and Now for a redo this winter if this don’t fix the bogging. Not sure if it will but a fresh rebuild will b good. I’m sure the inside diaphragm is very old.

I have the new cork gasket in. The bowl does not leak anymore. 2 problems.

The fitting on the side going to carburetor leaks when running. Is dry in the picture 5 minutes after running. Fittings seem tight.

Engine still bogs down. What happens with it is doesn’t really matter if hill or not after trying other situations. It happens when I floor the gas pedal and engine bogs down and I hear a hissing like sound. Vacuum leak? Soon as I let off of pedal truck runs fine and hissing goes away.

Is that a combination fuel pump vacuum pump (for wipers)?

You can use Permatex thread sealant (white) on the threads. Just a small dab a couple threads up from the end.

The fuel pump has a line coming in from gas tank then out to carburetor. You can see the small line between pump and engine. That comes from bottom of distributor and goes to carb. Then a line from carb to firewall which I believe goes to wiper although wiper doesn’t work. I can try permatex on the threads.

The last picture would not load but was of the complete line set up. Used the take photo option. Not sure if that works

First 2 pictures show the vacuum advance line from carb to distributor, as it should be, although we can't tell if the fitting is tight and not allowing vacuum leakage. 3rd pic shows vacuum port and line from manifold leading inside cab which should connect to vacuum wiper motor. If you are hearing a hissing sound in the cab, it's likely you have a vacuum leak on the line from the intake manifold to the wiper, or your wiper motor is leaking.

There should not be fuel coming out of that distributor vacuum line at the carb. I think you may have leakage elsewhere on the carb.

Dan. The fuel appears to be coming to be coming out of carb up there. Which I think is just leaking from bad carb gaskets. The fuel leaking out of fuel pump from line to carb was the concern. I’m going to try thread sealer on that. But the hissing when gas pedal being floored with loss of power I seem to hear that by my feet. If that vacuum line is leaking would it in addition hiss and cause engine to bog down. And can I plug vacuum line going to cab for now till I get wiper repaired. I was showing in pictures where lines were going to help decipher if fuel pump also had vacuum like Otto was asking. Thanks Glen

Yes. Vacuum leaks anywhere on an engine will cause poor performance, erratic idle, loss of power, etc.

Glen - Thanks for the clarification. Your pump is not the dual fuel/vacuum unit Otto was asking about. The hissing by your feet may actually be up under the dash. The hole through the firewall and vacuum hose into the cab is right above your feet, so it sounds like you perhaps have a cut/split vacuum hose.

Looking at your pictures again, the rubber hose through the firewall is passing through an unprotected metal hole. Could be rubbing against that has damaged the hose, or it may just be cracked/split from age. I would suggest disconnecting the rubber hose at the metal tube coming out of the intake manifold and capping off that tube. If the hissing stops, you've found the problem is somewhere in that rubber hose and/or up to the wiper motor.

Great, thanks for the advice. Truck idles fine and is all good except when flooring the foot feet. Previously I thought it was just a plugged filter which I now know that I don’t have a filter which I want to add. The only time I would put pedal to the floor was when going up a hill. So today I floored on level section of the highway probably going about 35 mph according to my phone gps, also did it at slower speeds just to see if I could create same issue. Same thing happened! So I will put the thread sealer on and see if I can stop the fuel leak by fuel pump fittings and cap off the vacuum line coming from carb and see what happens and get back to the thread. I’m sure my carb is leaking which would be another culprit if other leaks are stopped. I’ve read elsewhere that it may be the accelerator pump or even be fuel pump needing a rebuild. I’ll try the easy stuff first.
Glen

Glen - If it idles okay and response is good under slow/steady throttle pressure, I think it's time to move on to the carb itself as the likely culprit of your hard acceleration bog down.

I capped off the vacuum line going into cab and put thread sealant on both ends of the fuel line. I believe it might be a little better, probably my imagination. So I guess the carb has gas leaking in many areas so guess that is the next project. I might message Jon the carb guy to see what turn around time would be. And of course fuel pump will also need some work. It appears to be leaking fuel around the 6 screws. The hissing did go away 😎
Thanks Glen