ShawnP1980
Veteran
I did test fuel going to the pumps, so I disconnected the lines going to the pumps and blew in the vent and fuel came out. Now my other question is should I be able to blow in the side where the fuel pump pulse line goes in to the pumps? I've tried to blow in to see if I could get some air passing through the pumps and I get nothing.
Brotherdan
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No you can't blow air in the pulse line,have you checked&double checked all of your carb connections,hoses etc? Seems it ran fine before carb overhaul&now won't. did you remove the carbs off the machine for overhaul? &how far did you tear down the carbs?was this just for general maintenance?
ShawnP1980
Veteran
I had carbs completely removed and fully serviced at my Yamaha dealer that I've been dealing with for about 9 years now, I'm 99.9% all connections are good but will be going over all of it tomorrow after work. This is definitely not my first rodeo lol but definitely the first time I ran into this type of problem.
I will give an update tomorrow.
I will give an update tomorrow.
Paul
Newbie
I use a "squeeze ball" like what used on an outboard motor gas tank. Works great
ShawnP1980
Veteran
I thought of something like that but considering the fuel doesn't seem to be going any further then to inlet side of the pumps it wouldn't make sense as I would just be priming fuel to just the inlet and no further.
RobX-1
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If it wasn't for the fact that you stated you purchased new fuel pumps, it sure seems like all things point to them. I mean if you can force fuel out of the tank to both pumps by disconnecting the fuel lines going TO the fuel pumps but cannot force fuel through both fuel pumps by disconnecting the fuel lines going FROM the fuel pumps, then one would think the fuel pumps are the culprit. I realize you indicated you purchased new fuel pumps and the issue persisted but did you mean the sled would not start or that you could force fuel to the pumps but not through them or both? I could understand if you were able to force fuel to AND through the fuel pumps but was not getting fuel to the carbs that there may be an issue with the carbs but considering you are not able to get fuel past the pumps has me convinced that is where the issue lies unless I am missing something.
ShawnP1980
Veteran
I can't see the pumps being the problem considering that it ran with the original ones when I parked it last spring so I figured for the price I got new Yamaha ones for I figured why the hell not put new ones on it, so I put the new ones on with the serviced carbs and cranked it over nothing just cranks so I blew in the vent and I have fuel going to the pumps but not through to the carb side of the pumps I figured why not put old pumps on, and same frigging thing fuel to the pumps but not through to the carb side.
How strong should the pulse be on the line from boots to the pumps? I do have pulse just trying to rule that out.
Another thing is depending on how long pumps sit for can the diaphragm stick in the pumps? And cause the fuel to not flow through?
How strong should the pulse be on the line from boots to the pumps? I do have pulse just trying to rule that out.
Another thing is depending on how long pumps sit for can the diaphragm stick in the pumps? And cause the fuel to not flow through?
Brotherdan
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I
Sorry wasn't implying that you weren't experienced
Do you have a low pressure fuel guage you can use for testing?
I wasn't insinuating this was your first time working on an rx1 or wrenching,theres not alot of us left on here that are still running an rx1 so was just trying to help you out.sorry if this came across wrong.The fuel pumps on these sleds are very durable&very rarely need replacing,the diaphragms definetly will dry out after sitting,that&the fact the pumps are mounted up high (which they need to be) causes these machines to have a hard time drawing fuel after setting.How much fuel do you have in the tank?make sure there is plenty¬ just a gallon or two,5 gallons or a full tank is best in my opinion.If you fill the hoses to the carbs &then use a spray bottle to spray fuel in the carb throats&keep spraying until it has run a bit it should pickup the fuel.My experience with the bsr37 carbs is they have extremely small pilot jets&it takes nothing to plug them up.any rx1's ive worked on that wouldnt stay running on there own after pressurizing the tank or vent line&prefilling carb lines,then spraying fuel in the carbs was due to dirty carbs/jets.I know you said the carbs were overhauled but do you know what they replaced or did to them?Yamaha doesnt offer kits for these so you should have a huge list of individual parts that were replaced or its possible they used an aftermarket kit.I know you have used them for 9 years but it is possible something didnt get cleaned enough or replaced,it happens to the best of us.You have tried 2 sets of fuel pumps(one new oem set)so you can pretty well rule that out.sled ran before carbs were overhauled&now wont,What does the dealer that overhauled them say about your starting issues?
ShawnP1980
Veteran
Ok so sled will only run on fuel I feed it through the carbs I've tried both sets of pumps same crap. I will be trying an old set of carbs I have in the shop tomorrow to see if there is any difference.
Does anyone know how much of a pulse I should feel from the pulse lines to the pumps???
Does anyone know how much of a pulse I should feel from the pulse lines to the pumps???
Brotherdan
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I don't know of any way to measure the positive&negative pressure on a pulse line.make sure the pulse lines are tight on the engine,no cracks&no oil in the lines.
ShawnP1980
Veteran
Ok so I was going over the sled and I noticed that all the butterfly flaps in the carbs have a gap at bottom about 1mm and when I cover the carbs with my hands to allow much less air in while cranking it over, it seems to stumble and try to start?
Any ideas lol
Any ideas lol
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check that the throttle cable is adjusted properly. sounding like it might be tight.
ShawnP1980
Veteran
Will that gap in carb butterfly flaps cause it to not start?
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there is supposed to be a gap there for it to idle but if it is too big, it cannot make enough of a pressure difference to get the fuel into the cylinders. putting your hand over it is basicly starving for air or choking it and it sounds like it is trying to pull the fuel in when you do that.
JohnnyG383
Newbie
Any updates on this I hope you get to the bottom of the issue and figure this out I really like to know what the cause is here.
