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[JamesV6CDX]

Just had a lovely petrol shower and changed the fuel pump and filter for Bosch items

It’s not that - issue persists. It felt so, so much like fuel starvation, that I was convinced!

[Doctor Gollum]

When it's running can you feel any difference between the individual injectors? A dead or dying one will feel very different to a working one.

Not the easiest thing to check on an Omega V6 though.

[JamesV6CDX]

When it's running can you feel any difference between the individual injectors? A dead or dying one will feel very different to a working one.

Not the easiest thing to check on an Omega V6 though.

I’ve a spare manifold here with 6 known good injectors on. May give it a go.

It still feels totally like fuel starvation! Idles and runs fine until the power is commanded.


And then it’s just like the tank is dry - until lifting off the throttle

[JamesV6CDX]

Lambda values look ok, but I may just try running down the road with b2 s1 unplugged and see if anything changes

[Doctor Gollum]

Is there a vacuum on the filler cap?

And did you blow through the fuel lines?

[Raeturbo]

Try a vacuum gauge test could be a hidden leak.

[JamesV6CDX]

Went to machine mart today and bought a fuel pressure gauge to attach to the shrader valve on the rail.

1.5 bar at idle. When driving(or attempting to) it drops to 0.5 bar under power / load

Pretty sure these should run at 3.8 bar or thereabouts?

[Doctor Gollum]

Dying pump, as first suggested.

It may also be a failing regulator, if the diaphragm is susceptible to ethanol damage.

[TheBoy]

Pretty sure these should run at 3.8 bar or thereabouts?

Yes, I seem to recall it is around that ballpark

[cam.in.head]

seeing as you d already done the pump and filter then looking like regulator is next on the list then . at least you now know whats what !

[JamesV6CDX]

Regulator (in fact whole manifold) swapped for a tested and working one, and no difference

I suspect the cheap shit pump. Should have known better, will order a Bosch.

[cam.in.head]

sorry .i though you mentioned earlier that you had replaced the pump and filter with bosch items ?
at least now you know however that its a fuel pressure issue and bringing that back up to spec will solve your issue . theres not much else to check after that ( assuming the "in tank" hoses are ok and you havnt got a squashed or blocked pipe anywhere else !)(or checking the fuel pump is receiving a full 12-13v)

[JamesV6CDX]

Yes, but on reflection I don’t believe it’s a Bosch part, but rather, a cheap Chinese eBay copy. Having seen how much Bosch ones are elsewhere, it is inconceivable that the one I took delivery of is genuine

By cheap buy twice, and all that …

[lee4206]

Have you sorted this yet?  I had the same issue a few months ago and it was a small split in the hose that goes between the pump and the top plate.  I replaced it with a   " In-Tank Convoluted Fuel Injection Hose (Nylon) 260mm 7.5 - 9mm Heat Shrink End" from ebay,  It's been fine ever since.

[JamesV6CDX]

Thanks mate, I’ll check the hose. In honesty I haven’t even looked at it, she’s just been parked up as I have been abroad