Fuel Pump Issue. Bosch 040

[GotsWapan]

Greetings everyone.

Just got my R33 GTST back from the tuners an hour ago after a 3 hour drive home. Car was running great with the new turbine housing until I got home. It's breaking down on boost. It's jerking and popping/backfiring. Noticed my 040 is louder than normal and is making a constant buzzing noise that it didn't before.

Is it possible that it's on its way out or that its got really hot and over worked on this current 35C+ day?

Running 240rwkw

GTX3076R

Wolf 3d v4

Cheers

PS Tuners phone is busy, cant get a hold of him at the moment

Edited February 7, 2014 by GotsWapan

[Dose Pipe Sutututu]

do you have a wideband?

hard to say what's wrong without one over the interwebz

[scotty nm35]

I would suspect the fuel would be getting very hot on a long drive today, which would explain the noise.

The issue with the 040 is the fine mesh filter in the bottom, which is prone to getting blocked. There isn't much you can do with it if it is blocked either. Some have cut the mesh out but then there is no filtering on the pump. I would be getting a wideband on it, or dropping back in to your tuner to check the AFR's like Johnny alluded to.

[GotsWapan]

Fuel/Air

[scotty nm35]

Yes... but that was before your drive home, and before the breaking down. Something has changed since the tune by the sounds of it. Have you checked for popped cooler pipe joins? silicone has a bad habit of blowing after hard hot dyno time.

[GotsWapan]

Well no, I don't have a wideband unfortunately. Had a quick look over it for broken silicon couldn't see much. Made sure coilpacks are in tight. Haven't checked plugs yet.

[GTSBoy]

I have an 040 in R32 that makes a lot more noise when it is hot. Increases as the fuel gets hot too. So I would say what you are hearing is normal, but it doesn't mean that there isn't a problem, given the car was carrying on.

[Bushy]

Had a similar problem recently at a track day with a Bosch 040 in tank pump, after about 3 laps I would get pretty bad fuel surge when revving out in a straight line even with a full tank, wideband showed it lean right out when this happened (up to 19 AFR). Also the fuel pump got noticeably louder as the day went on. Possibly due to the mesh filter being a bit blocked but I just replaced it anyway with a DW200 pump. I haven't driven it hard yet but noticed at idle fuel pressure now sits around 38psi whereas with the 040 it was about 30psi. I should be heading to the track on Monday so I'll report back if it fixed the problem.

[GotsWapan]

Pump is probably 10,000kms old, never had any issues before but will definately pull it out and check the filter mesh.

Thanks fellas.
If it needs a new or bigger pump, am I able to change it without affecting the current tune?

[Dose Pipe Sutututu]

^ might affect it, will just make it a touch richer

that's about it

[GotsWapan]

I've got the pump out. Is there any way recommended to clean the mesh. It doesn't look too bad, then again I've never seen one properly before

[scotty nm35]

Can you test it somehow?

Not sure how to clean the filter, does it look like you can remove it?

[Kinkstaah]

I have had an 040 die, and yes it buzzed loudly before it did it.

The filter is kind of crap - It is NOT removable. You can clean it out a bit with brake cleaner and the like and put it back in. It's really very thin and there isn't much space behind it. I removed it (after cleaning it 2-3 times) and the damn thing died about 1km away. The difference between completely clogged and completely clean is very very VERY minimal (visually)

I never noticed my car do anything other than run until the pump flat out died. If you're way down on power, and banging and popping and backfiring, well I have a pump I can sell you

[GotsWapan]

Sounds silly but Istuck the vacuum cleaner on the end of it try try suck out any crap haha.

PM'd, Greg

[GotsWapan]

Still having issues. Car sometimes breaks down at 5000rpm, sometimes 6000. Most noticable in 2nd gear. Think I'll order a new 040 on Monday or maybe even a Walbro 255?

[scotty nm35]

Stick a Walbro 460L in there and forget it. Best intank pump available for the $200 it costs.

[Blackkers]

Mate I wouldn't drive it in that condition. If there's a fuel supply issue it could be pinging its head off

[GTR-N1]

I had a brand new 044 put into a VS2 once > started leaning out after 2 months. Hard wiring didn't solve it either. Flow rate check showed up 40% down at Unigroup Eng.

> took it back to Just Jap for warranty

> Just Jap sent it off to Bosch Melbourne

> They said it was OK

> sent it back to Just Jap

> Just Jap offered it back to me but it wasn't the same pump, because it didn't have the same texta "TT" that I put on it!!!!!

> Complained to Bosch Czechoslovakia

> Heard nothing

[GotsWapan]

Stick a Walbro 460L in there and forget it. Best intank pump available for the $200 it costs.

From what I've read thats an E85 specific pump. I don't have access to that fuel unfortunately.

I had a brand new 044 put into a VS2 once > started leaning out after 2 months. Hard wiring didn't solve it either. Flow rate check showed up 40% down at Unigroup Eng.

> took it back to Just Jap for warranty

> Just Jap sent it off to Bosch Melbourne

> They said it was OK

> sent it back to Just Jap

> Just Jap offered it back to me but it wasn't the same pump, because it didn't have the same texta "TT" that I put on it!!!!!

> Complained to Bosch Czechoslovakia

> Heard nothing

So did you go with that pump, Terry,or did you go down a different brand?

[GTR-N1]

Unigroup Eng. replaced it with another 044 of their own Tim < my own pocket