How To Test Motorcycle Fuel Pressure & Fuel Flow

[@vince5946]

Great video guys as always, very informative. Makes me remember why I love my carb bikes so much :)

[@motogravity4181]

I cant find in the website the fuel pressure tester, can u link it please.

[@ABc-oh3sn]

Hi can i know where u get the wiring diagram?(from website or anywhere?)

[@rmatvmc]

www.rockymountainatvmc.com/parts/husqvarna-oem-cd-rom-repair-manual-p Click on "change or remove machine" to get the correct manual for your bike. -Charles

[@HIinfidel]

What fuel line adapter did you use ? I can find the correct one

[@richardsanramon6357]

I have a kawasaki z250 sl that is not starting.electricalbis good, thinking that the fi is busted, we tested the fuel injector and it was spraying properly. the pump is also whirring when I turn the switch on. Does that mean that the pump is not generating enough pressure to push gas to the fi?

[@RickSchaefer-c1s]

Great video. What about a dirt bike w/o electric start? How would you check fuel flow, by kick start, will this allow flow of fuel from injector/pump?

[@rmatvmc]

With a kick start bike, your best option is to run the bike with the fuel pressure gauge, give it a few revs and see if the needle on the gauge drops significantly (more than a couple of psi). If you rev it and the pressure drops way down, you have low flow. With no gauge, disconnect the pump wires and jump power directly to it with a battery and some jumper wires (paying attention to polarity) and you should have flow. -Charles

[@ebonhawk7801]

For the fuel flow test if you have a kickstart bike will you be able to kick it over and the fuel pump start?

[@patw9175]

didn't even know there were kickstart EFI bikes

[@ebonhawk7801]

@@patw9175 2014 crf250r yessir

[@nickpeh1066]

What's the resistance of a bad fuel pump for in tank efi pump?

[@SwormCycles]

Gotta wonder how you do all those checks on a KX450 with no battery? All I can do is kick start it to "generate" the power to activate the pump.

[@rmatvmc]

Just run the pressure tester in-line. If you have low pressure or if it drops when you rev it up, you either have clogged filters or a worn pump. -Charles

[@myname9252]

My friends fz07 died on him on the highway. We get it home and come to find a connector to the pump came loose.(it wasn’t priming so I looked there first) I reconnect and checked the prime with it out of the tank. Fuel came out so at least I know it was working. Put it back in the tank and I tried starting it. The pump primed but again,the bike just cranks. Still doesnt start

[@wesleysriffle]

Does RMATV sell the pressure gauge? I cannot find a pressure gauge on the website via a search. If so I’m surprised it’s not linked directly in the info.

[@rmatvmc]

Unfortunately we do not sell the pressure gauge itself.

[@wesleysriffle]

@@rmatvmc what was the gauge in the video if I may ask?

[@rmatvmc]

@@wesleysriffle That was the Innova 3640 Fuel Injection Pressure Tester.

[@wesleysriffle]

I am absolutely lost trying to find the adapters for this? I cannot find anything online. I have a yz250fx and need to test the fuel pump. I found the tester in this video but nothing about the adapters. @@rmatvmc

[@idontknow3550]

Question: can you wash a air filter with just water and soap?

[@rmatvmc]

You can but regular soap will not get all the oil out of the filter. It's best to use the same brand of filter cleaner and oil.

[@TheSilviu8x]

@@rmatvmc Question: can you increase the fuel pressure, if there's no other means to regulate the air to fuel ratio, in a lean situation, on a modified, simple engine?

[@briansaathoff4038]

Are you using a pressure gauge for a car?

[@rmatvmc]

Yes, this same fuel pressure tester can be used for many different vehicles. They usually come with a few different adapters to work on a variety of fuel systems.

[@briansaathoff4038]

@@rmatvmc thank you

[@chrisherndon7045]

How do you check fuel pressure if your bike doesn't start?

[@rmatvmc]

Same, you just won't be able to do the running pressure. If pressure is ok and flow is ok, move onto something else. Check compression, check spark. -Charles

[@criticalthinking3709]

this is a nightmare

[@Gioagla]

Dude...how can you work wit thosw crap gloves on your hands... pff