bad fuel pump?

[Bronchopper]

so the bronc started running pretty erratic at idle yesterday. it runs fine as soon as you open the throttle, but it will not idle. i just did a tuneup a couple days before. it ran great for about 2 days after the tuneup. then out of the blue would not idle and runs kinda rough and wierd below 1500rpm. i have found junk in the carb (bowl and needle/seat) before. so i cleaned out the needle/seat and the float bowl). that did not help. floats are fairly new and working right, and the float level is good. i also replaced the fuel filter after the problem started. I actually have 2 filters on it. a clear plastic type and the one that screws into the carb. the old one was kinda dirty, but not bad enough to keep if from running. so with the new filter on there, i notice that it barely gets a trickle of fuel and never fills the filter. it does it on either tank as well. so is this the fuel pump going south?

 

[NYLES]

never fill s the filter.........

Id say try a new pump my last new pump would run down to a half a tank......after several bad days(my OCBR nightmares).....I figured out that with a full tank it ran great once down to a 1/2 its ran outa gas? (well acted the same).

bad pump and a full tank was feeding fuel by hydrualic pressure down to a 1/2tank try noting fuel levels(because you said it ran great for three days) fill it up and see how it runs. If runs good get a new pump.

Also if was mine id go with an electric pump.....but thats up to you(my bad pump was new with a few chasis runs and 50 miles on it, Id say bad out of the box).

 

[Buldozer]

Sure could be a fuel pump if you are using a mechanical. Not likely the fuel pump if you are using an electric type IMO. Check your carb idle fuel/air mix also. No idea of the type of carb your runing, but I have seen some carbs need readjusting from time to time. I have a holley that seems to need a little adjustment once in a while even though it has not been touched!

 

[Bronchopper]

Sure could be a fuel pump if you are using a mechanical. Not likely the fuel pump if you are using an electric type IMO. Check your carb idle fuel/air mix also. No idea of the type of carb your runing, but I have seen some carbs need readjusting from time to time. I have a holley that seems to need a little adjustment once in a while even though it has not been touched!

yeah, stock mechanical pump. pretty much stock '73 302. upgraded ignition (MSD) but otherwise stock setup. stock 2bbl carb as well. douibt it is mixture adjustment. it went from good to crap overnight. not like rich or lean setting... more like clogged fuel line.

tanks are both full. that didn't solve it. but the gage does not work, so i regularly run one or the other tank out and then switch over to the full tank. i think that is how i sucked up the junk in the fuel bowl in the past. that is what i thought it was this time as well. i guess it could be small obstructions somewhere else in the carb, but i am leaning toward the fuel pump being that i can see for sure that the filter is almost empty at all times. cheap and easy enough to change... can't hurt to start there.