ER6 running problem

[mossy1200]

Couldn't see it, starts convincingly even after leaving it turned on with the fuel line off to pump out the gas, and having to thumb the starter every ten seconds to get it to pump.

Shouldnt it keep pumping until it sees pressure?

[ducatilover]

Shouldnt it keep pumping until it sees pressure?

Probably just priming it so there's less current draw when you hit the starter?

[Drew]

There is an injector cleaner that can be added to the fuel ... might be worth a go too ...

If the fuel level in the tank was low when left ... the fuel does go off quickly.

Yeah, was thinking I'll run that through it on the way up to the garage I use.

Shouldnt it keep pumping until it sees pressure?

I used to think they pumped untill the pressure was right, but in fact the fule pressure is set mechanically and the ecu never knows anything about it.

Probably just priming it so there's less current draw when you hit the starter?

Primes when ya turn it on, and starts pumping as soon as the motor is turning.

[FJRider]

Yeah, was thinking I'll run that through it on the way up to the garage I use.

I used to think they pumped untill the pressure was right, but in fact the fule pressure is set mechanically and the ecu never knows anything about it.

Primes when ya turn it on, and starts pumping as soon as the motor is turning.

If it's a vaccum line ... the pump starts when you turn the key on. (if fuel pressure is down from that set on the pump) Turning the engine over opens the vaccum tap and fuel flows .... fuel pressure drops and the pump restarts.

[Bassmatt]

Apparently the stick coils, or whatever they are called, have a habit of fucking out.
?

[Drew]

If it's a vaccum line ... the pump starts when you turn the key on. (if fuel pressure is down from that set on the pump) Turning the engine over opens the vaccum tap and fuel flows .... fuel pressure drops and the pump restarts.

Chur, good to know how that works.

Apparently the stick coils, or whatever they are called, have a habit of fucking out.
?

Oh fuckin excellent. Might look into that. Weak spark fits the symptoms pretty well.

[White trash]

Do the basics first. Replace the plugs.

[ducatilover]

If it's a vaccum line ... the pump starts when you turn the key on. (if fuel pressure is down from that set on the pump) Turning the engine over opens the vaccum tap and fuel flows .... fuel pressure drops and the pump restarts.

Why does it need a vacuum tap?
I'm willing to bet it primes when switched on (fuel isn't going to go past the injectors with engine off, no need for vac tap)
Then maintains pressure once the bike cranks/starts.
Fuel pressure would be set by a vacuum referenced pressure regulator after the rail.

Do the basics first. line of coke and a skid.

Agreed

[FJRider]

Why does it need a vacuum tap?
I'm willing to bet it primes when switched on (fuel isn't going to go past the injectors with engine off, no need for vac tap)
Then maintains pressure once the bike cranks/starts.
Fuel pressure would be set by a vacuum referenced pressure regulator after the rail.

The vaccum tap (valve) only opens when the motor turns over. When the key is switched on ... it can only pump/prime with the fuel in the linefrom the vaccum valve and the pump (as the vaccum valve is shut) .... and pressurise the line from the pump to the carb/injector.
Electric fuel pumps should cut out when their set maximum pressure is reached. (the sign of a well set up fuel system is when you turn the key on and it doesnt need to pump) They are usually variable flow pumps ... so as to slow pump when fuel use/flow is slow. (At low speed/rev's) and full/higher rate at the higher speed/rev's)
From memory ... injectors require a very high rate of pumping pressure.

[Katman]

This site is full of clueless conjecture.

[ducatilover]

The vaccum tap (valve) only opens when the motor turns over. When the key is switched on ... it can only pump/prime with the fuel in the linefrom the vaccum valve and the pump (as the vaccum valve is shut) .... and pressurise the line from the pump to the carb/injector.
Electric fuel pumps should cut out when their set maximum pressure is reached. (the sign of a well set up fuel system is when you turn the key on and it doesnt need to pump) They are usually variable flow pumps ... so as to slow pump when fuel use/flow is slow. (At low speed/rev's) and full/higher rate at the higher speed/rev's)
From memory ... injectors require a very high rate of pumping pressure.

It doesn't have a vacuum tap, it has an internal fuel pump.

[bsasuper]

Pull the vacum line off the fuel pressure regulator, prime and see if fuel comes out, no fuel its ok, otherwise the diaphragm is leaking causing rich running.

[Drew]

This site is full of clueless conjecture.

As is any group of people, on nearly any subject. There is the odd very helpfull and insightful post that will get a bike back on the road.

Like this one of yours.

[GrayWolf]

I'll beat the rush. No one can solve my problems.

Unless than can tell me why an ER6 would run like a bag of shit after sitting for a couple months.

My only suggestion is.. that fuel evaporation has left some of that 'varnish type' residue inside an/the injector system????

[Mokadah]

I blame the government