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Fuel Pump Issue. Bosch 040

GotsWapan

By GotsWapan,
in Engines & Forced Induction

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GotsWapan Community Regular

GotsWapan

Posted
Posted (edited)

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 by GotsWapan
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https://www.sau.com.au/forums/topic/438787-fuel-pump-issue-bosch-040/
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scotty nm35
scotty nm35

As long as the connections are clean you should be fine. Not sure I would trust hot melt glue, but the lid is fairly easy to re-make in alloy, then find some proper high current sealed plugs, or sea

scotty nm35 Grand Master

scotty nm35

Posted
Posted

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.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

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.

Bushy Community Regular

Bushy

Posted
Posted

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 Community Regular

GotsWapan

Posted
  • Author
Posted

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?

Kinkstaah Grand Master

Kinkstaah

Posted
Posted

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 ;)

GTR-N1 Grand Master

GTR-N1

Posted
Posted

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 Community Regular

GotsWapan

Posted
  • Author
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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?

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