PLease help anyone, please

[apexnfever]

I own an apex mtn, really weird, running great no turbo, still stock, had the sled sent in to be re-clutched as it was hitting the rev limiter, once the dealer took it out for a test run it shut down,will turn over, but no fuel is being pumped to the motor, I had a diffrent fuel pump hooked up, and still same problem, when you hook up the plug to the fuel pump, at the fuel pump, and stick volt meter on the two lines one red one black, the power is shut down, unplug the the wires from the fuel pump, and the volt meter reads 12 volts, plug it back in, and the volt meter reads no volts, so once it is pluged in no volts, I took a 12 volt battery hooked it up directly to the fuel pump, and the sled will start the fuel pump does run continously, but still it shows that the pump is ok.

So somthing electrical is shutting down the power going to the fuel pump when it is pluged in, but when its unplugged it has power all the way to the plug that plugs into the pump at the pump.

Confuessed someong help please.

No codes at all come accross.

 

[pro116]

check your fuses or relay

 

[SRXSRULE]

Sounds like a bad relay, or ground problem to me. Anytime you are trying to check an electrical item you need to check it under "load". Use your volt meter and do a voltage drop at the fuel pump with the connector hooked up. If you dont know how to do a Voltage drop, do a google search and look it up. Your not just putting the red and black lead on the pump connector. This test will find if its a power or ground problem.

This is all common testing methods that your dealer should know how to do. Eric

 

[apexnfever]

Sounds like a bad relay, or ground problem to me. Anytime you are trying to check an electrical item you need to check it under "load". Use your volt meter and do a voltage drop at the fuel pump with the connector hooked up. If you dont know how to do a Voltage drop, do a google search and look it up. Your not just putting the red and black lead on the pump connector. This test will find if its a power or ground problem.

This is all common testing methods that your dealer should know how to do. Eric

The tech did a votage drop test on the connector, connected and disconnected, no drop on either.

the only time the voltage droped was when you turn over the sled at the key, due to the voltage going to the starter.

Good thought, we did switch the relays, but still same problem.

 

[SRXSRULE]

If you voltage dropped the power and ground at the connector with the pump hooked up and it tested ok and does not run the pump........Then the pump wouldnt run when you jump 12V to it with a battery.

cunfused. Eric

 

[Tork]

2 wires going to the pump or 3 or 4?

 

[REXX]

I wonder if there isn't some kind of sensor or something that shuts the power down to the pump. Did you disconnect the sleds battery momentarily and reconnect it??
I've had mine upside down for several minutes and it just fired right back up.

 

[apexnfever]

2 wires going to the pump or 3 or 4?

two, black and red with a blue strip

 

[apexnfever]

If you voltage dropped the power and ground at the connector with the pump hooked up and it tested ok and does not run the pump........Then the pump wouldnt run when you jump 12V to it with a battery.

cunfused. Eric

Then my idea of a voltage drop compaired to your idea of a voltage drop are diffrent, I am sorry.

Help me understand better, now I am confused

All I am saying is that when you disconnect the plug on the pump and turn it over it reads 12 volts on the plug, but once you plug in the pump and test the plug while it is plugged in, no power gets to the plug at all, somewhere in the motor its shutting down power once the plug to the fuel pump is plugged in, so in other words once all is plugged in and the circuit is complete, no power, diconnect the plug, power flows to the plug.

 

[SRXSRULE]

A voltage "Drop" tests for bad connections. If you are testing the ground circut place one lead of your volt meter on the ground wire at the fuel pump and the other at the ground terminal of the sleds battery. Try and run the pump by turning the key on. Your metter will show the voltage being dropped in the circut. Anything more then a couple tenths of a volt is not normal. A few volts and you have a major problem. test the power side the same way, one lead to power on pump and one lead to positive terminal on battery. The positive terminal is likley your problem. Eric

 

[apexnfever]

A voltage "Drop" tests for bad connections. If you are testing the ground circut place one lead of your volt meter on the ground wire at the fuel pump and the other at the ground terminal of the sleds battery. Try and run the pump by turning the key on. Your metter will show the voltage being dropped in the circut. Anything more then a couple tenths of a volt is not normal. A few volts and you have a major problem. test the power side the same way, one lead to power on pump and one lead to positive terminal on battery. The positive terminal is likley your problem. Eric

I will run this by the tect this morning.

 

[SoCoRX1]

call Chad at 719-587-4039 (Peak motorsports, a yamaha dealer). He is the smartest tech that i know and could probably tell you exactly the problem and where it is located on the sled. he rides a turbo RX and put my sleds together for me. I can call him on the mountain with a crap description and he will know how to fix it right then and there. i would give him a call and tell the tech what he says.

 

[bashley]

All of the Apexes are having this problem. It is the fuel pump relay located above your left foot behind the plastic. There are four relays, I belive the fuel pump is the third one in. If it won't start for you before you get it replaced just take out the one closest to the tub and switch it. It is the headlight relay, I think it's the only one with the same prong setup. Anyhow, your headlight might take a minute to come on but your sled will start for sure.
My Attak did this two or three times before I learned what it was. I thought it was ice in the fuel system so I would thaw the sled out real good, add some HEET, and it would start like a champ. I guess these are "Fair weather relays".