just a few questions to start this out right
1. will a bike run fine if its low on gas, maybe 12oz in the tank?
2. if the fuel pump is going out, will it start and idle fine when cold, but have trouble or not start at all once warm?
3. what kind of flow should be comming out of the outlet side of my fuel pump? i.e trickle, full force like a water hose or somewhere in between?
4. would a kinked fuel line cause a pump to go out?
5.will you help me fix this 97cbrf3?

 

Running a fuel pump out of fuel or low on fuel is VERY BAD for the pump, because the fuel lubricates the internal parts and cools it as well.

It could idle fine, it depends on how much fuel is in the tank, if it gets too hot it will run like ***.

Not sure if that bike as a return line or not, pressure would be an easy way to tell if it makes enough pressure, but that would not tell if it can flow enough to maintain pressure at redline.

A kinked line could, because its another restriction the pump has to fight (like a fuel filter) on a daily basis.

Fully checking a fuel pump requires an oscilliscope, to determine the pump rpm, if the commutator bars are hitting the field coils (determines if a pump is bad or not) and the current draw as well.

 

ok well the fuel seems to flow more freely comming straight from the petcock thru the filter and out the fuel line, than it does to flow from the outlet on the fuelpump.... the fuel filter is not clogged....and if its flowing better just by gravity, that would pretty much say that the pump is bad, right?

 

I wouldn't personally know, because I don't know how much volume that pump should be providing, if you knew that you could flow test it, but if the pump is barely putting out anything at all, and if gravity would do a better job at pulling fuel than the pump does, a replacement could come into play.

 

well, i cranked it over, and now it wont start at all.I think i may have fouled my plugs, I drained off my bowls and they seem to be getting sufficent amounts of fuel from the pump, I'm beginning to think that the pump is intermittent, I'm going to replace the plugs and attempt to run without a pump and see if that does the trick, if so, a pump replacement it will be.