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A Bosch 040 Failure?

nisskid

By nisskid,
in Engines & Forced Induction

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T04GTR Grand Master

T04GTR

Posted
Posted

OH, YOU HAVE BYPASSED THE FUEL PUMP CONTROLER HAVENT YOU? (if in dought just earth the earth of the pump and it will get full voltage all the time. my 32 had a simalar problem. turns out it was the controler not the pump lol.

so just eath the negative pump wire and see how you go. and definatly get the shop to put a fuel pressure guage on it to see if its doing what i think its doing.

MANWHORE Grand Master

MANWHORE

Posted
Posted (edited)

t04gtr, like you, I don't like the boschs for the same reasons. People are always like buy the bosch, buy the bosch. There is absolutely no advantage buying a bosch over others (except a slight price difference, whcih is diminished when you have to buy 2 040s in 2 months)

unlike others who have found that they dimish when they get hot, we've replaced a few that have actually broken.

Edited by MANWHORE
TurboX Mentor

TurboX

Posted
Posted

I also replaced the stock pump with the bosch in tank 040 which I bought from Speed Tech in Mitcham.

When I bought it they removed the one way valve which they said was not needed.

Every Fuel pressure gauge I have put on there (4) has beaten itself to death in a short time with excessive fluctuation.

I put the one way valve back in the line hoping to stabilise the reading but it has not helped.

I also have a Malpassi silver top on there as well.

Not sure which way to go from here.....

nisskid Grand Master

nisskid

Posted
  • Author
Posted
OH, YOU HAVE BYPASSED THE FUEL PUMP CONTROLER HAVENT YOU? (if in dought just earth the earth of the pump and it will get full voltage all the time. my 32 had a simalar problem. turns out it was the controler not the pump lol.

so just eath the negative pump wire and see how you go. and definatly get the shop to put a fuel pressure guage on it to see if its doing what i think its doing.

no idea, the problem is gone, not sure what was happening there. still grinds n shit, i just hope its not struggling and thats what the stuttering is here and there. time for a tune.

GeeTR Grand Master

GeeTR

Posted
Posted
I also replaced the stock pump with the bosch in tank 040 which I bought from Speed Tech in Mitcham.

When I bought it they removed the one way valve which they said was not needed.

Every Fuel pressure gauge I have put on there (4) has beaten itself to death in a short time with excessive fluctuation.

I put the one way valve back in the line hoping to stabilise the reading but it has not helped.

I also have a Malpassi silver top on there as well.

Mappassi's are well known to pulsate the pressure a little.. or a lot :domokun: >> http://www.skylinesaustralia.com/forums/in...998&hl=SARD

Bosch pumps do get groany when the fuel heats up. When mine wasn't receiving full volts it was so bad the floor pan would vibrate and could be heard/felt over the radio.

Rofl - nice. Hey are you using the 040 or 044. As with TO4GTR's comment below.....

the o44 is a gem. no dramas regardless of mounting style

Are yall saying its just the 040 that gets noisy when hot? As I thought both models were quiet similar bar, mesh and one way valve?

I thought the noise was a direct result of cavitation when the fuel gets hot. I figured the bubbles found it easier to make their way to the intake from the return, or maybe just the extreme vacuum and turbulence over the rough threaded fitting caused it.

If the 044 doesn’t get as noisy as the 040, read: doesn’t cavitate as much, there must be a reason. Are more people fitting the stock sock to 044’s?

*ponders*

Swink33 Community Regular

Swink33

Posted
Posted

I had an 040 that failed on me. It just got really noisy sometimes then it became all the time followed by fuel cut. I promptly changed it with a Denso pump (also made by Bosch). The reason I was given for the failure was that I had a lot of crap in the bottom of the tank. I got the tank flushed and have not had a problem since. The Denso is also a lot quieter.

I have also heard that the filter in the 040 is not very good at filtering out rubbish compared with the sock design of most other pumps. From my experience it is well worth spending extra on a proper Nismo, Tomei or Denso pump and save yourself the potential hassles.

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