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Fuel pump problems..please read

Husky33

By Husky33,
in Engines & Forced Induction

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Husky33 Veteran

Husky33

Posted
Posted

Hey guys

I have a Bosch 040 fuel pump in my R33 which i have had int he car for around 5 months or so. Last weekend on the way home, it suddenly starting making a really loud whining noise. To me it sounded like vibrations, as the pitch changed as the revs of the car changed. At idle it is really loud, where as as you reach higher revs it got less audible. When the car is off, and you turn the key to prime the fuel pump, the sound is very very loud. Louder than when driving, u can hear it clearly from outside the car.

The last couple days it's being on and off, usually when the car is cold it's fine, after a while it begins.

Anyone have any ideas on what i could be. Are these the symptoms of a dying fuel pump, although is shouldnt be after this time.

It's just annoying as i'm trying to sell my car, and it's pretty embarrising and hard to explain when they are driving the car and suddenly this massive whining can be heard..lol

Any help much appreciated

Simon

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Husky33 Veteran

Husky33

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  • Author
Posted
Most Bosch pumps get noisy when they get hot or a run low on fuel, was it on a full tank or was the level quite low?

Yeah it was on a medium tank, then i filled up and it still did it. The only thing is that it hasnt done it for half a year, and the noise is quite loud.

I';ll take it apart on the weekend and see if i can notice anything. The pump is mounted to the cradle with just a normal clamp, it may have come loose. Pretty sure the cradle is mounted correctly so i doubt that would have come loose. I'll check it out anyway

Thanks guys

So this is not what a fuel pump sounds like when it's on it's last legs???

Chris Wilson Proficient

Chris Wilson

Posted
Posted

The pickup strainer "sock" may be clogged, if it's trying to pull fuel through a clogged sock it will be very noisy and the output flow could be dangerously reduced. A clooged filter in the pressure sise 9normal fuel filter) will make the pump work very hard, and could make it noisy.

However, rotary pumps do NOT like running dry, if it's been run very, very low or out of fuel that will certainly knacker it.

Husky33 Veteran

Husky33

Posted
  • Author
Posted

The pump doesnt use a sock, it just has the mesh filter at the base of the pump. Well i had a look, pulled it out. Everything seemed fine, put the pump back in, made sure the cradle was in the holder. For the first day is was fine, but last night is started making the noise again. Doesnt for the first 5-10 mintures of driving, but after that is very loud.

So u think a clogged fuel filter may be causing this?

Husky33 Veteran

Husky33

Posted
  • Author
Posted

Well i changed the fuel filter and it still makes the really loud vibration noises.

Now one thing i noticed was that each of the 3 times i have taken the fuel pump out since it started making this noise, the mesh on the bottom of the 040 had some shit on it, like lint. I just wiped it off, put the pump back in, and each time it's fine for either the first few hours to a day, but after it starts again.

Anyone have an idea, starting to think the fuel pump is farked

PHATGTR Collaborator

PHATGTR

Posted
Posted
Well i changed the fuel filter and it still makes the really loud vibration noises.

Now one thing i noticed was that each of the 3 times i have taken the fuel pump out since it started making this noise, the mesh on the bottom of the 040 had some shit on it, like lint. I just wiped it off, put the pump back in, and each time it's fine for either the first few hours to a day, but after it starts again.

Anyone have an idea, starting to think the fuel pump is farked

This might sound strange but in my 180 it was really loud when it was hot or if I had the aircon on for some reason?

PHATGTR Collaborator

PHATGTR

Posted
Posted
Nah i dont see how a dyno will fix/find this problem, as the car runs fine it's just the noise i'm worried about

Put it on the dyno to check your Air-Fuel Ratios to make sure there isn't a problem with the pump.

I don't think the noise is your major concern,. Whether or not the pump is doing it's job properly is much more important.

Husky33 Veteran

Husky33

Posted
  • Author
Posted

Ok the fuel pump is shagged. Replaced it with a walbro for the time being and the noise is gone and the car runs heaps better surprisingly.

So this pump lasted 5 months farkin! It was bought of a certain someone who used to sell "genuine" bosch pumps, but after actually lookin at the pump in detail it's doesnt look like a genuine bosch pump.

Not surprisingly this certain person is not selling "genuine" ones anymore, but copy's.

  • 2 years later...
Terminal Grand Master

Terminal

Posted
Posted

I'm just curious, I've had this problem occur with my old 040 and was wondering if it might have been caused by something else? I've replaced the pump, but I just wanted to make sure it won't happen again and wreck another pump.

Has anyone had a similar experience or know enough about the RB25DET's fuel system to know what part failure might cause the pump to make this noise?

  • 2 months later...
green 33 Explorer

green 33

Posted
Posted (edited)

Hey has there been a resolve to this issue????

I myself have gone thru a walbro, 2x GTR pumps (secondhand), 1x 040 (new) and then put a new 044 in and it seems to be doing the same

the GTR pumps when they went, just became noisey and wouldn't create pressure above 60ps

The 040 when it went, became noisey then at load would completely die but at idle would still create pressure

Now the 044 has become noisey and will not create pressure above 90ps

I have done the wiring mod and then even tried with new relay and wiring problem still occured, now i have just had a friend with an external setup have the same problem, which was going to be my next thing to try (surge tank setup)

i have pumped all fuel out of tank but i have not removed tank and had flushed and cleaned

just hoping someone here has actually done something that has completely resolved the issue, after all there seems to be many on the site that have this issue??

Edited by green 33

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