pump push rod

[kelly]

I've had a lot of help with the problem I'm having, so Thanks to all.
This is my last thing to do. It's the pump push rod. I just can't see it being the problem,
but I've tried everything else. Why would it work some times and not at other times.
Any one have this problem? Gets gas and then it stops getting it while on a drive. No gas out of the fuel pump out let side. New everything and the 2nd pump. (manual carter)
Thanks all.

 

[Seventy]

Maybe if it was getting stuck down away from the shaft, but I never seen that before. How does it look? Mushroomed? Most likely your problem is in the tank, pickup, or fuel filter or something like that, how long does it take to do? is it turning a corner, on a hill anything like that?

If its a short drive, grab a roll of hose, run it from the pump to a gas can, go for a ride if it never dies, drop the tank and check her out, you could have a broken pickup, **** in the tank, etc..

How do you get it to start back up once it dies? sorry I am new to your issue, but I will try to help

 

[kelly]

at times I prime the carbs other times it just starts up. It seem to idle fine, it's just when I take it for a drive and it's about 2 miles then it starts to die. I took off the line to the pump from the tank and put a rag over the tank filler hole and blew air into it. A lot of gas came out but I did not see any thing that was abnormal.
thanks for the help.

 

[Yatzee]

Obviously you fuel supply is OK for small demands at the carb but the bowls are running dry at high demands. You have the option of cutting a pressure gauge into the line using an extension of fuel line from the "pump to carb" feed pipe to a visible area you can see when driving. If you currently have a fuel filter installed in this area it's an ideal spot to insert a tee. 3 to 6 lbs. of pressure is easy to keep from leaking. I would pull the push rod and measure it because the pump may be short stroking at the arm. If the rod turns out to be OK the above method is the only way of telling if the pump (and everything before it) is at fault or if the floats are hanging closed at the wrong times. You may well just have a poor adjustment of the float(s) or their hanging up. If your pump is sucking air into the fuel line under high pulsation, this will show up in a "see thrue" fuel filter just before the carb providing it's semi verticle position. You'll have to rev the motor and hold it there for a while to see if bubbles are coming through with the fuel.

 

[A383Wing]

New rods are 3.25" long.....and when they wear down to 3", then fuel problems start to arise....

what does yours measure?

 

[kelly]

I'm going to have to take it out. I'll let you know when I do. Why would it work and then quit if it was short?
Thanks

 

['73bird]

New rods are 3.25" long.....and when they wear down to 3", then fuel problems start to arise....

what does yours measure?

Why does hughes say there fuel pump push rod is 3.200 if its supposed to be 3.25?

 

[kiwigtx]

Happened to me quite a few years ago, and the effects were first felt as I crossed the finish line in a drag race with a long-time friend. He didn't speak to me for a while after that - since I beat him by 0.001 and we were staring each other down as we passed the finish line. He called me a sandbagger, but turned out that my 6BBL had run dry due to the 1/4" missing off the end of the fuel push rod. After seeing the evidence some time after, we were all good. Doesn't help that he is probably the most consistent & best DYO racer I know.

 

[ws23jrt]

Why does hughes say there fuel pump push rod is 3.200 if its supposed to be 3.25?

The optimal length is not a precise number. ---.200" is a big deal but .050" is not.

 

[A383Wing]

I have 3 brand new pump rods here, all measure 3.25" in length

 

['73bird]

I have 3 brand new pump rods here, all measure 3.25" in length

Hughes brand?

 

[kelly]

well mine was 1/4 in short. Cut off by the looks of it.

 

[A383Wing]

well mine was 1/4 in short. Cut off by the looks of it.

Most likely just worn down over the years, put a new one in and you should be good to go again. You probably won't find any metal fragments in the oil filter or the pan, it's just been slowly wearing over time, kinda like tires

Rule of thumb is that things start to happen when the rod gets worn 1/4" or more