my v6 just cut out

[cheffy34]

Hey guys gotta a techie for you lot to chuck your ideas up at, driving back from having an unproductive days fishing with my son and my van just cut out and had to be flat bedded home, (all ignition lights came up on dash like when you first turn the key) iv'e done some diagnostics this morn and i have fuel pressure and a spark at the plugs but it will turn over fire momentarily for a split sec then just turn over? (almost like fuel starvation) any ideas where i should be lookin bare in mind it had new cap, rotor arm, leads and all look fine, I don't know where to look next, i suppose i need to find someone to hook him up to a computer to look for a fault code but that is easier said than done down here.

Its a real bitch i've just finished refurbing my rx8s and can't show them off cause it stuck outside my skanky nieghbours It has been doing so well aswell lately aswell


Pi##ed off i hate driving the saab need to replace the dam turbo on that aswell


Ideas aprecciated


Dar

[bigdaddycain]

How do Dar... Let's start with the basics mate... Are you absolutely,positevely, certain that there is any fuel in? I once trailered my car to the local garage assuming the cambelt had snapped... There was simply no fuel in it as the gauge had stuck on half full (half empty?) It cranked over really quickly like the cambelt had snapped too! But there was no go juice in

[cheffy34]

How do Dar... Let's start with the basics mate... Are you absolutely,positevely, certain that there is any fuel in? I once trailered my car to the local garage assuming the cambelt had snapped... There was simply no fuel in it as the gauge had stuck on half full (half empty?) It cranked over really quickly like the cambelt had snapped too! But there was no go juice in

Yip affraid so, filled up in the morn, got fuel pressure when i whipped the fuel line off and cranked it gave me lots all over my hand and exhaust, luckilly it wasn't hot I have checked the cam belt aswell it was the first thing i double checked seens i did change it myself and that was my first thought sah## thee belt snapped but it hasn't, was running fine all day then it just coasted to a halt


But atleast my shabby chrome rx8s aren't so shabby now just satin black

[mikeonb4c]

Sorry to hear that Cheffy. I presume there's no spark?

[Northern Bongolow]

fuel shut off switch on the pump maybe, either supply or the plunger switch.
they are known to give problems on the diesel, so maybe same on yours.

[missfixit70]

Don't have them on petrol cars usually do they?

[cheffy34]

Sorry to hear that Cheffy. I presume there's no spark?

Nope has a spark at the plug mike, wants to fire but cuts instantly


Dar

[Northern Bongolow]

Don't have them on petrol cars usually do they?

dont know but its worth a punt im sure they must have something similar on em.
modern petrols usually have a collision shut of to turn the pump of in case of fire /accident.

Electric pump
Electric fuel pump
A piston metering pump f.e. gasoline- or additive metering pumpIn many modern cars the fuel pump is usually electric and located inside the fuel tank. The pump creates positive pressure in the fuel lines, pushing the gasoline to the engine. The higher gasoline pressure raises the boiling point. Placing the pump in the tank puts the component least likely to handle gasoline vapor well (the pump itself) farthest from the engine, submersed in cool liquid. Another benefit to placing the pump inside the tank is that it is less likely to start a fire. Though electrical components (such as a fuel pump) can spark and ignite fuel vapors, liquid fuel will not explode (see explosive limit) and therefore submerging the pump in the tank is one of the safest places to put it. In most cars, the fuel pump delivers a constant flow of gasoline to the engine; fuel not used is returned to the tank. This further reduces the chance of the fuel boiling, since it is never kept close to the hot engine for too long.

The ignition switch does not carry the power to the fuel pump; instead, it activates a relay which will handle the higher current load. It is common for the fuel pump relay to become oxidized and cease functioning; this is much more common than the actual fuel pump failing. Modern engines utilize solid-state control which allows the fuel pressure to be controlled via pulse-width modulation of the pump voltage. This increases the life of the pump, allows a smaller and lighter device to be used, and reduces electrical load.

Cars with electronic fuel injection have an electronic control unit (ECU) and this may be programmed with safety logic that will shut the electric fuel pump off, even if the engine is running. In the event of a collision this will prevent fuel leaking from any ruptured fuel line. Additionally, cars may have an inertia switch (usually located underneath the front passenger seat) that is "tripped" in the event of an impact, or a roll-over valve that will shut off the fuel pump in case the car rolls over.

Some ECUs may also be programmed to shut off the fuel pump if they detect low or zero oil pressure, for instance if the engine has suffered a terminal failure (with the subsequent risk of fire in the engine compartment

interesting bit at the end with poss oil pressure link. ,

[cheffy34]

Don't have them on petrol cars usually do they?

dont know but its worth a punt im sure they must have something similar on em.
modern petrols usually have a collision shut of to turn the pump of in case of fire /accident.

Electric pump
Electric fuel pump
A piston metering pump f.e. gasoline- or additive metering pumpIn many modern cars the fuel pump is usually electric and located inside the fuel tank. The pump creates positive pressure in the fuel lines, pushing the gasoline to the engine. The higher gasoline pressure raises the boiling point. Placing the pump in the tank puts the component least likely to handle gasoline vapor well (the pump itself) farthest from the engine, submersed in cool liquid. Another benefit to placing the pump inside the tank is that it is less likely to start a fire. Though electrical components (such as a fuel pump) can spark and ignite fuel vapors, liquid fuel will not explode (see explosive limit) and therefore submerging the pump in the tank is one of the safest places to put it. In most cars, the fuel pump delivers a constant flow of gasoline to the engine; fuel not used is returned to the tank. This further reduces the chance of the fuel boiling, since it is never kept close to the hot engine for too long.

The ignition switch does not carry the power to the fuel pump; instead, it activates a relay which will handle the higher current load. It is common for the fuel pump relay to become oxidized and cease functioning; this is much more common than the actual fuel pump failing. Modern engines utilize solid-state control which allows the fuel pressure to be controlled via pulse-width modulation of the pump voltage. This increases the life of the pump, allows a smaller and lighter device to be used, and reduces electrical load.

Cars with electronic fuel injection have an electronic control unit (ECU) and this may be programmed with safety logic that will shut the electric fuel pump off, even if the engine is running. In the event of a collision this will prevent fuel leaking from any ruptured fuel line. Additionally, cars may have an inertia switch (usually located underneath the front passenger seat) that is "tripped" in the event of an impact, or a roll-over valve that will shut off the fuel pump in case the car rolls over.

Some ECUs may also be programmed to shut off the fuel pump if they detect low or zero oil pressure, for instance if the engine has suffered a terminal failure (with the subsequent risk of fire in the engine compartment

interesting bit at the end with poss oil pressure link. ,

what possible oil pressure link

Ya scaring me


Dar

[Northern Bongolow]

sorry not trying to scare you ,just maybe saying the cause of the fuel pump shuting off the fuel supply could be triggered by the ecu or an impact switch, these have been around for a few years now,so something to consider.

[cheffy34]

sorry not trying to scare you ,just maybe saying the cause of the fuel pump shuting off the fuel supply could be triggered by the ecu or an impact switch, these have been around for a few years now,so something to consider.

[g8dhe]

Yes the Fuel pump is controlled by the ECU, and as we don't know the programming or circuits on the ECU we can only at present guess what could be controlled for.

[rita]

Hi have you checked that the injectors are firing.

[The Great Pretender]

Dar, as you have a spark why not try spraying wd 40 into the intake, if it keeps running while spraying it looks like the fuel system is the problem. Worth a try.

[cheffy34]

Dar, as you have a spark why not try spraying wd 40 into the intake, if it keeps running while spraying it looks like the fuel system is the problem. Worth a try.

ha ha i remember doing that old trick on one of my mini's to find a leak on the inlet manifold I most certainly will give it a bash Mr P


Dar