Mounting fuel pump?

[Cool1]

Anyone have any ideas for mounting fuel pumps so that they dont vibrate/resonate and shit me to tears?
I have an external Walbro type which I'm wanting to mount in my boot where the jack used to be.
So anyone have any thoughts? Some pictures would be nice also

[Ben Wilson]

I've heard of people putting stubby holders around the round ones before mounting them as a form of isolator.

[Norbie]

Just use heaps of rubber and you'll be sweet. Between the pump and the bracket, and between the bracket and the body.

[Hen]

Rubber mounting is a good idea. You can buy special rubber mounts and clamps for some pumps. I just cut up some old bike tubes and wrapped them around the pump until it was around 5mm thick.

Stubby holder sounds like a good idea too, nice and thick to start with.

Also it's important not to do up the mounting bolts so tight that you crush the cushioning rubber. Tight enough to hold the pump of course, but you want it to be able to vibrate as easily as possible without transmitting it straight into the chassis.

Hen

[YLD-16L]

I've heard of people putting stubby holders around the round ones before mounting them as a form of isolator.

In a similar technique I have mine wrapped in a dense foam (from Clark Rubber or some other store) and then mounted to the inside of the boot. The foam made an enormous difference to the noise of the pumps from inside the car.

More recently I mounted the low pressure pump in the spare tyre well on some flat bar (pump wrapped in foam) and that reduced the noise a tiny bit more than when the pump was mounted directly to the boot floor (wrapped in foam).

[Cool1]

Thanks peoples. I'll make a trip down to clark rubber and see what I can find

[1200det]

What about that expanding foam filler

[o_man_ra23]

Im not sure about everywhere else in the country, but up here in north qld heat is a great concern. And, if you ask anyone in the electrical business, heat is the major cause of failure in anything electrical, especially electric motors. By wrapping in foam, you are insulating the pump from the cooling effects of the boot. Having just enough foam to cover the clamp (with a little extra sticking out for safety sake) is probably the go. Also, gluing the foam to the pump will aid in the process, by reducing the amount you need to tighten the clamps. And before anyone says "but fuel cools the pump, not air", you are partially right, but the air aids the cooling dramatically, and also reduces the temp of the fuel going into your injectors(as the heat escapes into the air, not the fuel), which is why high end fuel pumps have aluminium heatsinks on them. For anyone who has just stuck a stubby cooler on their pump and clamped it like that, i would be saying to you to cut off any excess stubby cooler so you get the coolest fuel you can.

Cheers, Owen

[JustCallMeOrlando]

Don't know about you, but my external Walbro came with a foam sheath, and my fuel pump isn't really any noisier than my factory one, and it's mounted in the same bracket.

[oldcorollas]

Don't know about you, but my external Walbro came with a foam sheath, and my fuel pump isn't really any noisier than my factory one, and it's mounted in the same bracket.

both my internal Walbros came with that foam, and apparently it is ok for submersed use?? (i hope so ) and then it is just cable tied to mounting bracket (using supplied "fuel resistant?" cable tie???

i can only just hear it when car is off, and the tank is effectively in cabin...

so yeah.. some dense neoprene or similar around clamp as others suggested..

[Cool1]

Damm, my pump didnt come with any foam?!

[oldcorollas]

the foam it comes with is abotu same thickness as stubby holder, but is a bit higher density with smaller pores... i think some 4 or 5mm thick neoprene would be pretty much perfect for the job

[o_man_ra23]

The only ones ive ever heard of that come with foam are the in tank ones. And yes, the plastics and foams used in the in tank items are fuel submersible. The external ones however have a different cooling system. Frank, does your walburo have some sort of fan running through it to get the air by?? Just the way i see it with an external, if you rely solely on the fuel to cool the pump, then the fuel is going to be nice n hot when it gets to your fuel rail... good for when you wanna ping, or have your timing retarded.

Cheers, Owen

[CrUZida]

My intank Walbro didn't come with foam, neither of them did.

But when the next one goes in (different car) its going to get some rubber insulation.

Existing one has no insulation and you could just hear it over idle, worse when the fuel level was below the pump.
Better now that I have PWM pump speed control.

[.T.]

i sell a billet bracket designed for bosch type pumps, very nice, but not to cheap.
some guys use the mounting brackets off efi camira's - not as neat or as good looking, but cheap

T