Jump to content
SAU Community

Recommended Posts

Hi all,

just installed a Bosch 040 pump to my car. It runs well, no hassles there, but it makes this noise every so often that makes me nervous.

At idle, probably once a minute or so every now and then it makes a very quick noise. Its like a suck/grind in one hit. Very weird. What could it be?

I have fitted the stock pump until I work out what it is.

The pump is new, and is sitting at the same height,maybe a few mm's lower?:confused:

Link to comment
https://www.sau.com.au/forums/topic/3440-fuel-pump/
Share on other sites

I get the same in mine. I believe its something like the returning fuel is being dumped right beside the pump, and its hot, and the pump doesn't like pumping hot fuel. I have a fuel pressure gauge hooked up, and it gives a bit of a flutter every time this noise occurs.

Link to comment
https://www.sau.com.au/forums/topic/3440-fuel-pump/#findComment-57653
Share on other sites

Yes, mine tends to do it after a warm start, and only apparent at idle. Since it happens even with a full tank, perhaps hard to believe its hot fuel causing this.

Had a chat with one of the guys where I got the pump, he's suggesting that with minimal clearance of the pump to the bottom of the tank (mine is set up with only 5-10 mm clearance), the pump is actually sucking itself onto the bottom of the tank. Hard to say, my X-ray vision abilities ran out many years ago.:lol:

Link to comment
https://www.sau.com.au/forums/topic/3440-fuel-pump/#findComment-58466
Share on other sites

fixed that noise, its pretty simple to fix. I found out that the return line from the motor was blowing air around the pump, causing the noise. Was better with a full tank of fuel, but still not right.

I attached a peice of fuel hose to the outlet and placed it so the fuel coming back was pumped at right angles to the pickup and the air bubbles were not near the pick up. No more noise.:uh-huh:

Link to comment
https://www.sau.com.au/forums/topic/3440-fuel-pump/#findComment-58478
Share on other sites

I reckon its caused by the massive amount of extra volume that the pump is pumping. It would be pumping much more fuel back, and when its getting to the outlet pipe in the tank its blasting back in around the fuel tank , causing air to be pushed from the tank into the fuel around the pump, like when you squirt a hose into a bucket of water. By re-positioning the line coming back in, the fuel isn't pumping air around the pump., and no more noise

Link to comment
https://www.sau.com.au/forums/topic/3440-fuel-pump/#findComment-58494
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • No not yet.  Hopefully this weekend if I can pluck up the confidence!  I had to sit in the car at one point yesterday to unbolt the rear struts.  As mentioned in an earlier post when I was putting it together there is still a bit of rotation possible so when I sat in the car, it rotated a little bit.  I near shit myself thinking the whole thing was coming down!  I do 99% of my own shit in the shed but I think I might call on some assistance the first time I spin it!
    • Strong first post. On a Skyline-centric forum. Have you considered actually going out into the world, visiting the actual dealership, and asking the parts guy over the counter? Or at least just call them up on the phone?
    • Should shit that in as for the driver ability probably not
    • Trying to find the plastic under cover for an 04' Forester X. The main under cover that covers most of the front of the vehicle under the engine. This has turned out to be a crazy experience. Normally I can find parts for vehicles, if I have the correct info, no problem. But not this! The Forester is a non-turbo btw. In a Forester parts catalog, for model years 03'-06', it shows part# 56410SA070 as being the correct part. So I go to the local Subaru dealership's website to order it. I type in the part#, hit search and there it is, the under cover. "DOES THIS PART FIT YOUR VEHICLE?" I type in my VIN# and sure enough, "This Part Does Not Fit Your Vehicle. See Similar Parts For Your Vehicle." I click on that and part# 56410SA000 comes up. Looks absolutely nothing like the previous part. Not even close. So I go to a different Subaru dealer website and put in that 2nd part# (56410SA000) and "This Part Has Been Replaced By" 56410SA070, which is the first part I looked up. I thought OK, makes sense. They replaced the strange looking part, with the one I looked up first, so I add it to the cart. "Does This Part Fit Your Vehicle?" I type in my VIN#, and sure enough, "This Part Does Not Fit Your Vehicle." I've basically been doing this with various parts suppliers and dealerships, for the past 4 hours! Does anyone know what the hell is going on?? Thanks in advance!   
    • have you rotated the car yet? if so how smooth was it?
×
×
  • Create New...