Bosch 040 In R34 Gtt Issue

[mystery_kid]

Hi

i have installed a bosch 040 in my r34 gtt it is now also wired on it's own seperate circuit

everything works fine apart from the fact that after a few minutes of the car running the pump then develops this rather loud buzzing sound and left long enough the car won't get enough fuel to boost. the sound can be replicated by just started the car and letting it idle, it will happen after a while say a few minutes

if i turn the car off and start it again straight away the sound will continue straight away, if i turn the car off for a couple of minutes it will take a few minutes again for the sound to develop

when the sound is about to start i can hear like clicking/kind of slurping sounds almost coming from the pump, i'm thinking it is cavitation or turbulence with the bottom of the tank starving the pump maybe ?

this has been a bit of a saga for me over the past months with other shit going wrong so i'm about ready to buy a walbro and sell the 040 because i'm fairly over it heh

any help would br much appreciated

thanks

Edited August 25, 2012 by mystery_kid

[scotty nm35]

Sounds like the filter is clogged in the bottom of the pump...

[mystery_kid]

yeah i know but the filter is fine, i wish it were that easy lol

[Kinkstaah]

I had this exact issue and went through multiple pumps and eventually had to remove and clean the tank.

I know that buzzing sound all too well and had identical symptoms. How sure are you that it isnt clogged?

Sure as in pulled it out and looked at the mesh sure? Sure as in cleaned the mesh and checked it isnt clogged up again after you pull it out again sure?

Sure as in tried a different 040 and waited for that dreaded buzzing to happen again? The last thing you want (believe me) is to buy multiple pumps to find out the tank is infact full of shit.

[GTR-N1]

Have you tested the pump flow out of the car? Unigroup Eng tested a new one in mine and the flow was starved.

There's a Bosch 040 thread under Just Jap forum.

There have been issues with this pump in past batches as you will read. Although 99.5% are just fine I'd estimate.

Just Jap sent my pump and others to Melb. Czechoslovakia didn't want to know about it. Melb tested mine and said it was OK.

I received it back in my original box (as I left a special mark on it); but the special mark I left on the pump itself was not there.

Just Jap were led to believe by Bosch that it was the same pump of mine that was sent there (Melb) for testing; but it was obviously a different/new pump that came back - and that's how they honour a warranty pffft

[mystery_kid]

I had this exact issue and went through multiple pumps and eventually had to remove and clean the tank.

I know that buzzing sound all too well and had identical symptoms. How sure are you that it isnt clogged?

Sure as in pulled it out and looked at the mesh sure? Sure as in cleaned the mesh and checked it isnt clogged up again after you pull it out again sure?

Sure as in tried a different 040 and waited for that dreaded buzzing to happen again? The last thing you want (believe me) is to buy multiple pumps to find out the tank is infact full of shit.

finally someone who knows what i am talking about

you know you're possibly right, i have pulled it out and there has been some black stuff on the mesh which i've cleaned off but other times i pull it out and it looks fine - really hasn't ever looked like enough to cause the issue

anyway i have ordered a walbro from just jap and i'm going to send the 040 back to them, they will send it away to bosch - so we'll see

i have had the pump running off a spare battery in the tank before for like half an hour trying to see if there was something in the tank blocking it and the sound never happened, but it wasn't getting a full 14volts off the spare battery

either way i've spent like 4 weekends now dealing with this pump issue since the old one died to where i am at now

[owenliberts]

clean your tank out, sounds like its shit in the tank. run it for a while it sucks up shit, turn it off to pull pump and most of the shit falls off the strainer making it look ok when you pull it out!

[Kinkstaah]

finally someone who knows what i am talking about

you know you're possibly right, i have pulled it out and there has been some black stuff on the mesh which i've cleaned off but other times i pull it out and it looks fine - really hasn't ever looked like enough to cause the issue

anyway i have ordered a walbro from just jap and i'm going to send the 040 back to them, they will send it away to bosch - so we'll see

i have had the pump running off a spare battery in the tank before for like half an hour trying to see if there was something in the tank blocking it and the sound never happened, but it wasn't getting a full 14volts off the spare battery

either way i've spent like 4 weekends now dealing with this pump issue since the old one died to where i am at now

I too took it out, cleaned the filter (it didnt look like enough to clog it but believe me it does) as I found out myself.

If you clean the filter, put it in, and it becomes clogged again, well the problem is not the pump.

My commiserations if you end up having to pull the tank in a backyard like me . I ended up with just a GTR pump (almost the same as 040) but holy shit is it loud. But as long as it works, who cares

[Akshunhiro]

Have you done the fuel pump earth mod? I'm sure the 34 is setup the same way where the fuel pump won't get full power at idle. Think it's dropped down to 9v or something when idling/off throttle. I was surprised to learn about it myself so did the mod and my pump sounds so much healthier especially when priming.

Just re-read your post, nevermind hahaha.

Edited September 3, 2012 by Akshunhiro

[mystery_kid]

so i put a walbro in, all fine now

i'm just going try and manage whatever sediment is in the fuel tank, i put a new fuel filter in the other week so i will check that after 1 months usage and change it if need be and just use fuel additives for a while to do what i can

tanking the fuel tank out looks like a pain in the ass that i really don't have time for now as i'm about to be balls deep in my thesis and final semester of uni

thx bros

Edited September 9, 2012 by mystery_kid