After I installed my Walbro pump, at start up I get this really weird vibrating cooing sound. It sounds similar to coolant boiling, but I coudl feel it through the floor board if I am sitting in the passenger side back seat. It goes away after a few seconds which is what baffles me.
Is it possible for the Walbro pump to be too long and bottoming out in the fuel tank resulting in the vibration? I installed everything correctly (drilling the bracket about 1/4" above, used new rubber isolator...etc).
Let me know before I go in there and hack off the nipple 1/4" to shorten it.
#91322, "RE: Walbro fitment question" In response to Reply # 1
Yo Kaiser,
I did not have that problem, but, when you turn your car on, the pump primes for like 1 second. This may be what you are hearing or it may be bubbles in your return line shaking the hardline.
#91337, "RE: Walbro fitment question" In response to Reply # 0 Nov-11-05 06:59 AM by thedawg
Originally posted by eclipsekaiser Is it possible for the Walbro pump to be too long and bottoming out in the fuel tank resulting in the vibration? I installed everything correctly (drilling the bracket about 1/4" above, used new rubber isolator...etc). Let me know before I go in there and hack off the nipple 1/4" to shorten it. Thanks. Kaiser
YES ITS TOO LONG! I dun told you nukka- you needs to hack off 1/4 from the brass hard line on the fuel sender, and from the rubber hose between the sender and the pump outlet.
Hacking the sender will NOT screw it up, you can still install the stock pump back in with a longer rubber hose. The hose clamp will hold without that extra 1/4" and nipple.
The Walbro 255 will hit the bottom of the fuel tank and vibrate unless you cut off that nipple. You may need to re-drill the bracket a little higher once you chop it.
EDIT- Be careful when taking the rubber hose off the walbro outlet. There is a metal nipple clamped on to the plastic pump that has a check valve built into it. It's weak, and the nipple and checkvalve can pop off if you pull the rubber line too roughly.
#91373, "RE: Walbro fitment question" In response to Reply # 5
I dont get what the issue is here? all i did was take the old pump out and i drilled another hole in the bracket like a 1/8 in up and remounted everything with the new walbro, no cutting hoses or anything and mine doesnt vibrate or show any issues or hints of problems??? fit like a glove.
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Custom stage 2 hahn turbo kit Hahn Super 16g turbo (ceramic coated) Hahn manifold (ceramic coated) Hahn Downpipe assembly Hahn intercooler piping smic Hahn oil line kit Type s bov 2G Gsx smic walbro 255 fuel pump Synapse missing link Vortech s-fmu NGK Bkr7e11 Plugs A-pillar w/boost, a/f, oil pressure gauges
#91393, "RE: Walbro fitment question" In response to Reply # 8 Nov-14-05 04:20 AM by thedawg
For grain & others- I'm pretty sure there's two different GS/GST walbro's. I don't feel like researching exactly what the differences are, but some of the fittings included with the pump and the overall length are different.
As far as the cooing- walbros do hum. Theyre supposed to. It should go away as soon as you give it a little gas. You were describing a vibrating sound, which they shouldnt do. If you had come to the meet I could have checked it out for you.
#91402, "RE: Walbro fitment question" In response to Reply # 9
Nukka, I was at a OC car auction from 9-4, afterward just kicked it at my sisters in HB.
I'm fairly sure there is air trapped in there. I will drive it around for a bit to see if it will purge itself. I was planning on redoing the whole fuel system down there anyways.
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