Starts but won't stay running By pissedmopedman (Read 22,841 times)

[pissedmopedman]

Nov 2, 2014 10:27:00 GMT -6 rks said:

Maybe I missed something along the way....But I have read this whole thread. Have you solved the gas in vac line problem? As stated above, your fuel pump diaphragm is bad. Any gas dumping through the carb, would be sucked into the cylinder as soon as the intake vave opened, not forced into a line leading to a closed system. The gas in your vac line is leaking by your fuel pump diaphragm. I might suggest a Mikuni pump, they are a good one, and rebuild kits are available for them. Also replace the vac line that has the screw in the end with a proper vac cap.

So I have had two bad pumps ?? I always see it coming out of the ex manifold end first, Never see it coming from the pump,

NOT buying any more pumps!! Will take a sledge hammer to the whole @!$#ing first. If that sounds like I am pissed off I am, but not at anyone on this board, at the whole situation. I bought this on 8/1/2014 I should not be going through this.  
Will make video tomorrow night with TWO different cams, one of the pump, and one of the Intake manifold at the same time and the gravity feed. Hopefully I get out in time.    

[pissedmopedman]

Uploading Two videos to YT now, SHOULD be up by the morning. One at the Intake manifold line side of it, and one from the Fuel pump side. For the people who have said it's coming from the fuel pump. These two videos were taken at the same time, of the vac lines. 

Intake manifold side. 5th video


Fuel pump side. 6th video

[drahken]

i sorta dont see no fuel coming through that purple line. maybe your vacuum lines, i dont know if thats how that works, mines gravity petcock fed, that black line, dont know if you have vacuum and its not operating becuase of it. if it needs vacuum.. to operate, try sucking the vacuum line and hitting your starter button. just keep vaccum on the vacuum side line and it should operate the fuel pump. find out why theres no vacuum or why the lines not got nothing in it. your running on vapors

[Alleyoop]

On the FIRST VIDEO where you say EXHAUST SIDE(WHICH IS REALLY THE INTAKE MANIFOLD VACUUM PORT). I see fuel in the VACUUM line NOW is the FUEL COMING FROM THE PUMP or is it COMING FROM THE INTAKE MANIFOLD?
Because if the FUEL is coming from the INTAKE MANIFOLD AND NOT from the PUMP that is a problem with the motor. And the problem would be EITHER TIMING and or THE INTAKE VALVE.

IF THE FUEL in the VACUUM in video one is coming from the FUEL PUMP then the FUEL PUMP Sorry to say is bad. But I did not see fuel coming from the fuel pump so SOMETHING IS NOT RIGHT WITH YOUR MOTOR, TIMING OR INTAKE VALVE.

So DID You do anything to the motor and or take the cam chain off and or take the FLYWHEEL OFF etc..
Alleyoop

[drahken]

ive figured it out. we've seen 2 different things here. the pump running. which that was about the most confusing video, of all. cause the bike was running. when it ran. and it ran, the same.

ive only watched your videos long enough to see, the bike start, leans out, quits, runs outta gas. then, i hear you crank it for about 15 more seconds then i turned it off. so thats all i watched.

and we've seen that. the bike run for 20 seconds, then quit. that, is about enough time for the bowl to empty. are you maybe perhaps, priming it to start it? filling the float bowl full of gas?

and the only line we've seen during it running at least as far as i can see, good, is the purple line you had coming from the intake. the gas that does come int it, is only seeming to barely, vibrate up into there. gas would pass by that hole and with, no suction or any thing at all going on on that line, since it runs to the gas tank line in on your fuel pump, teh gas is just sneaking in there.

trying hooking your lines up straight, and crank it over. if its pumping gas as you showed, you probably figured this out by now.

we havent proven any diaphrams are leaking, but its not a bad idea to think of that. just lets fix it one step at a time. though.

and now, im going to watch one of your videos all the way through.  i will empty my bowels into my pants if i see it crank up after the first running for 20 seconds or soemthing.  ahhh

[drahken]

cause my question is, how does it get any gas period.

[drahken]

Oct 31, 2014 22:01:37 GMT -6 pissedmopedman said:

Oct 31, 2014 12:37:20 GMT -6 Alleyoop said:

Great, so it is working the VACUUM line goes on the SMOOTH CONNECTOR and the Black HOSE GOES on the KNURLED connector, It is pumping plenty of fuel.
Alleyoop 

Right, but why won't it stay running ? Could the intake manifold have a crack ?? Should I check the gravity feed set up just to start eliminating stuff 

what is video 3 about?  is it the green line that goes to the carb at the pump side?  why is there no gas coming through it?  i couldnt tell if i was looking at the purple or green line from the lighting, that was in it.  if it pumps gas when its not on the bike the bike even runs, then why isnt it flowing on the bike?

[pissedmopedman]

Nov 6, 2014 0:34:53 GMT -6 Alleyoop said:

On the FIRST VIDEO where you say EXHAUST SIDE(WHICH IS REALLY THE INTAKE MANIFOLD VACUUM PORT). I see fuel in the VACUUM line NOW is the FUEL COMING FROM THE PUMP or is it COMING FROM THE INTAKE MANIFOLD?
Because if the FUEL is coming from the INTAKE MANIFOLD AND NOT from the PUMP that is a problem with the motor. And the problem would be EITHER TIMING and or THE INTAKE VALVE.

IF THE FUEL in the VACUUM in video one is coming from the FUEL PUMP then the FUEL PUMP Sorry to say is bad. But I did not see fuel coming from the fuel pump so SOMETHING IS NOT RIGHT WITH YOUR MOTOR, TIMING OR INTAKE VALVE.

So DID You do anything to the motor and or take the cam chain off and or take the FLYWHEEL OFF etc..
Alleyoop

Sorry I corrected it now says intake manifold 

Both of the above videos are of the same line AT the same time 

[pissedmopedman]

Nov 6, 2014 0:34:53 GMT -6 Alleyoop said:

On the FIRST VIDEO where you say EXHAUST SIDE(WHICH IS REALLY THE INTAKE MANIFOLD VACUUM PORT). I see fuel in the VACUUM line NOW is the FUEL COMING FROM THE PUMP or is it COMING FROM THE INTAKE MANIFOLD?
Because if the FUEL is coming from the INTAKE MANIFOLD AND NOT from the PUMP that is a problem with the motor. And the problem would be EITHER TIMING and or THE INTAKE VALVE.

IF THE FUEL in the VACUUM in video one is coming from the FUEL PUMP then the FUEL PUMP Sorry to say is bad. But I did not see fuel coming from the fuel pump so SOMETHING IS NOT RIGHT WITH YOUR MOTOR, TIMING OR INTAKE VALVE.

So DID You do anything to the motor and or take the cam chain off and or take the FLYWHEEL OFF etc..
Alleyoop

It's coming from the intake manifold 

No I didn't take anything off. 

[pissedmopedman]

Nov 6, 2014 2:53:28 GMT -6 drahken said:

Oct 31, 2014 22:01:37 GMT -6 pissedmopedman said:

Right, but why won't it stay running ? Could the intake manifold have a crack ?? Should I check the gravity feed set up just to start eliminating stuff 

what is video 3 about?  is it the green line that goes to the carb at the pump side?  why is there no gas coming through it?  i couldnt tell if i was looking at the purple or green line from the lighting, that was in it.  if it pumps gas when its not on the bike the bike even runs, then why isnt it flowing on the bike?

I have now labeled ALL videos 1-6 and beyond if need be.
what video are you referring to?

[Bashan]

Gas could still be coming from the pump towards the manifold regardless of how it looks. Under vacuum a liquid can leak through and be in a gaseous or semi-gaseous state until it condenses and accumulates. So you just might not be able to see it coming down from the pump, but it might be there. When it condenses near the manifold it would appear to be coming from the manifold when in fact it is not. So this is not definitive. Has the gravity feed happened yet? I still think that would be a good experiment/test. If the thing acts exactly the same it is not the pump.

[drahken]

video labeled moped problems 3 the 5th video.

if, that video is of the green line, its not running gas how it was running it in the video i guess.. 4th video, named moped. at the bottom almost of page 3.

thats all im seeing. im thinking in 5th video, that its the green line and its barely spurting any gas. so you've got no gas flow. but im not screwing with it anymore. get some good light, show the gas line. your bike doesnt run but we dont see the fuel pump operating correctly. i cant say your fuel pumps not hooked up right. do it.

[cyborg]

I second the motion of setting up a temporary gravity fuel feed,,, this will put all the conjecture to bed once and for all

[pissedmopedman]

Didn't get paid this week, so everything is hold for a week or less.

[pissedmopedman]

Sorry for the long delay having work problems.
Gravity feed was a bust, there was No difference. Starts but then soon dies. I did find the compression checker and will doing that this weekend, what would be the range I am looking for??