fuel problem

[prjacksonau]

got a problem with my vn 5lt - when driving along motor just cuts out wont start for up to 20 mins unless i spray sum avaitation fuel up the airintake - have replaced fuel pump, filter oxy censer and in jectors are new can happen when motor is cold or hot - anyone got any ideas

[delcowizzid]

could be a faulty ignition module or wiring as the ecu takes pulses from that to tell it when to fire injectors.

[prjacksonau]

the ecu is only new also

[red truck]

My VN berlina wagon 5L had 2 pumps, one inside tank, one outside. Not sure about sedan though.

[prjacksonau]

yeh they both been replaced

[prjacksonau]

ok replaced the ignition module and still no go

[anarklov3r]

If it wont start again for 20 minutes, could very well be the crank angle sensor. This is what happened in my car. Easiest way to confirm is to carry a bottle of cool water with you in the car. Next time it stalls, make sure it wont start. Pop the hood, and poor the cool water over the CAS (Crank angle sensor). Its located behind the harmonic balancer. You will see the wires come out from behind.

If it starts up after wetting it a bit and cooling it down, Theres your problem.

I got mine replaced for $150 i think? or was it $130? Either way the part is ~$80-90 from holden, and to change it the belt and balancer has to come off.

[delcowizzid]

its V8 so doesnt have the CAS behind the balancer.does the fuel pump still prime when it wont start

[anarklov3r]

Totally skipped over that first bit of the post.....

....damn skim reading.

[prjacksonau]

yes you can hear the fuel pumps purring away when its doing it

[red truck]

You sure it's fuel? Might be time to go back to basics and check for spark.
What's with the av gas? Does that make it go again straight away, or you still have to wait?

[prjacksonau]

i spray a bit of avgas up the airintake and it fires up straight away - thats what make me think its a fuel problem

[red truck]

Have never seen one, but someone told me there is gadget you can get which plugs into the injector wiring connector, which flashes an LED light when a signal is getting to the injectors. Apparently cheap, can be found in auto parts joints. Would at least tell you if injectors are firing, but won't tell you if they are getting fuel.

[kiwi ss]

Have never seen one, but someone told me there is gadget you can get which plugs into the injector wiring connector, which flashes an LED light when a signal is getting to the injectors. Apparently cheap, can be found in auto parts joints. Would at least tell you if injectors are firing, but won't tell you if they are getting fuel.

Yeh they're called Noid lights. get em from Repco and the like. Theres two types of pins on them. Square and round. 5.0's use the square ones.

[kiwi ss]

When it cuts out, does it cough and splutter, or just stop. Have you checked for any fault codes?