Fuel pump issues

RobJPS · Post by **RobJPS** » Wed Jul 26, 2017 9:41 pm

Hi I have an issue as my bike starts and ticks over nice then after two mins dies of lack of fuel.
Turn ignition off and on pump primes starts straight off?? 2 mins repeats?
I have no reserve switch would this affect this? Wiring was in a state so I've got everything working but am I missing something ? It's driving me mad

Post by **nugget** » Wed Jul 26, 2017 10:13 pm

Check to see if the fuel pipe isn't kinked anywhere.

RobJPS · Post by **RobJPS** » Wed Jul 26, 2017 10:33 pm

Tried that all ok?

oldskoolexup · Post by **oldskoolexup** » Thu Jul 27, 2017 12:56 pm

Rob. How have you wired without reserve switch?

oldskoolexup · Post by **oldskoolexup** » Thu Jul 27, 2017 1:04 pm

A "stab in the dark".......It's possible it's been wired as if the fuel switch is in the on position as opposed to reserve therefore turning the fuel pump off when the level in the tank goes below the sensor. You can still "force" the pump to prime the carbs when turning on and off and that might be what you are experiencing.

Can you photograph the wiring and post?

RobJPS · Post by **RobJPS** » Thu Jul 27, 2017 6:48 pm

I can't send pics but the wiring was a massive mess when I got it but I've got everything working as it should. I have not found the reserve switch wiring yet? I'm looking at that tomorrow.
It runs for about 5 mins cuts out as running out of fuel soon as it stalls it will start up and run again for 5 mins??

I've not had it on the Road yet from its rebuild so only running in the shed and it gets hot and fan kicks in ok so all electrics are working ok. I've got a spare fuel pump so probably try that ?

oldskoolexup · Post by **oldskoolexup** » Thu Jul 27, 2017 7:01 pm

when you shine a torch in the tank, is the fuel level well above a sensor mounted on the end of a vertical post?

oldskoolexup · Post by **oldskoolexup** » Thu Jul 27, 2017 7:05 pm

and when you restart, do you hear the fuel pump clicking?

RobJPS · Post by **RobJPS** » Thu Jul 27, 2017 7:10 pm

Plenty of fuel and sender is disconnected as no fuel gauge on my clocks as non standard(worked fine last time on the road)and pump primes every time you switch ignition on.

oldskoolexup · Post by **oldskoolexup** » Thu Jul 27, 2017 8:06 pm

"worked fine last time on the road"......

in that case, keep us posted as I assumed it'd just been wired up and ignitor box "ECU" was turning signal off to pump.......good idea to check spare next though ...good luck

RobJPS · Post by **RobJPS** » Thu Jul 27, 2017 9:03 pm

Ok cheers will keep you posted

oldskoolexup · Post by **oldskoolexup** » Fri Jul 28, 2017 10:48 am

Thinking on......Can anyone confirm if the sender in the tank is connected to the "ECU" or more directly to the fuel pump or via relay?

Cheers

redapple · Post by **redapple** » Fri Jul 28, 2017 9:42 pm

Hi

sort of went through the same series of problems you had as I just bought a exup and it wasn't in the best of conditions and doing it up.

- take the tank off and check the fuel petcock, even check to see if it blocked. I would also do the same with the fuel filter you can even blow through it, and you can tell from the pressure on your hand how bad it is.. Both of mine were blocked pretty badly.
- the next time my reserve switch wiring was lose and was not short circuited together both wires were lose and hanging free. The bike would run for about 2-5 mins then die. Red/black and Red/green wire on my bike.