Total power cutoff while driving

[dougmbill]

New fuel pump, fuel filter, fuel pump relay, fuel pressure sensor, MAFS, crack position sensor. Random cutouts. Runs fine for a few days, then nothing.

[Theiceman]

So when its wont run have you established if you have spark and/or fuel ??

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[EvolutionArmory]

Any codes to work from?

[a4lownslow]

Codes would be nice.. I’m just gonna throw out fuel pump control module


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[dougmbill]

It tries to start so it has spark. Seems to be fuel issues. One commonality of last two breakdowns: rain.

[dougmbill]

Yep, about only thing left. Anybody been able to change it without dropping tank a bit to get to it?

[dougmbill]

Dont have access right now but recall 0093 and 2293-Low fuel pressure. But these are prior to new lpfp. But its acting the same now after new pump.

[EvolutionArmory]

Dude, if you want help you really should tell us what you’ve done, what codes, you know, information that might actually be useful. Don’t make us drag it out of you post by post.

[EvolutionArmory]

Thanks. Saw that you gave more info after I posted. If it seems to mainly happen after it rains, check your rain tray drain under the battery, pop it open or just remove it and then open the ECU box and look at the relays under the ECU. Those control a lot of engine electrical functions. One of which is the fuel pump.

[dougmbill]

That a strong possibility. I changed fuel pump relay and didn't see water but it wasn't raining. I'll update when I investigate.

[dougmbill]

VAG code is 12555. The fuel systems seems to be over-pressurized at the the HPFP. It will run for a mile or two and then stall. When I relieve pressure at inbound fuel line it will start. One suggestion was check control module for corrosion or replace. Code tell anyone anything?

[audilove3]

you will figure this out without EVo talking about rain in the batterytray and ICe talking about basics like fuel and spark, useless

[EvolutionArmory]

you will figure this out without EVo talking about rain in the batterytray and ICe talking about basics like fuel and spark, useless

Retard, you know that water in the ECU is known to kill the relays under the ECU, right? What do you think those relays supply power to?

Please do us a favor and jump off a bridge. Nobody will miss you so don’t worry about it.

[Jake@JHM]

Water in the ECU box is pretty common. Definitely check it out like Evo mentioned

[EvolutionArmory]

Not only is the fuel pump relay in there but the other relays also supply power to quite a few different parts of the fuel injection system. And since it happens more after a rain, common sense would tell you that it would be worth looking into what might be getting wet.

Audilove3 shoots his common sense up his veins so be careful about listening to what he says.

[dougmbill]

Not only is the fuel pump relay in there but the other relays also supply power to quite a few different parts of the fuel injection system. And since it happens more after a rain, common sense would tell you that it would be worth looking into what might be getting wet.

Audilove3 shoots his common sense up his veins so be careful about listening to what he says.

No apparent water in ECU box. Going to replace both 614 relays while I'm in there. Replaced mechanical pressure regulator below PVC. It's not throwing CEL. If that's not solution, control module next. Any other thoughts?

[Theiceman]

No apparent water in ECU box. Going to replace both 614 relays while I'm in there. Replaced mechanical pressure regulator below PVC. It's not throwing CEL. If that's not solution, control module next. Any other thoughts?Definitely go with those first and report back. I'm wondering why overpressure will stop.it from running. Unless car is seeing this and intentionally shutting down pump.

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[EvolutionArmory]

Yeah dude, the valve under the PCV is just a valve that opens when fuel overpressure is achieved. It isn’t a regulator in the normal sense of the word as it only reacts to overpressure.

I suppose it could stick open and just vent fuel pressure back and cause a problem but it would probably be the last thing I’d go after.

If all of the ECU relays are good next I would go after the low pressure fuel sensor on the high pressure fuel pump. I don’t know what testing equipment you have but you could check rail pressure with a mechanical gauge and compare it to VCDS. Say you have 5 bar on the gauge but VCDS says you have 3 or 10. Probably has a bad G410 sensor. Those numbers are just examples but if your pressure gauge and VCDS readings are way off, it could be a low pressure sensor.

From there I’d check low pressure fuel pump duty cycle with VCDS. Block 106 at operating temp idle. It should be 50% at idle. Anything over that is suspect. 60% or more is a big problem. From there you need to find out if the pump is worn out or if there is a restriction further up the fuel system like a blocked fuel filter, kinked hose or something in the HPFP.

http://wiki.ross-tech.com/wiki/index.php/P310B/012555

[dougmbill]

So new relays (614s under ECU) did not fix it. The LPFP and HPFP are new (VDO and OEM) respectively. We even swapped on another used HPFP, with same result. It will start and run fine if I release pressure at joint above fuel rail. Since I got it back from mechanic with new HPFP, the engine will rev between shifts (M6), which it didn't do prior to new pump. Having previously replaced the pressure valve on the manifold, its down to fuel line blockage or HPFP control module unless I'm missing something. I don't have pump pressure instruments. The Millenium 90Pro scan says no fault codes. SMH.