Hi folks, I recently completed an engine swap in my 74 Chevy C-10 from a straight six to a 350. The fuel pump (external electric) I purchased is noisy and sounds like a bee is in the cab with me. Does anyone recommend a quiet pump that delivers around 6-1/2 psi to the carburater? I have an Edelbrock 650 cfm carb, running around 300hp. Some internet threads suggested a Carter or Mallery, but the Mallery's are more pricey. Thanks - Darren
why not just use a mechanical pump? you can still have the electric , and put it on a switch so you only turn it on when needed
Small little rubber mounts and a bit of clever thinking will help quiet it down. You also get what you pay for, its very easy to make a cheap and noisy pump, versus a efficient and quiet pump. Good Luck, Welcome to the HAMB, BDM
Diaphragm-style electric pumps are quiet. Also, they only come on as needed, rather than running continuously like the Holley and most other actual 'electric-motor' driven pumps. At the most a diaphragm pump will only make a slight 'clicking' noise when it comes on. If you use it as a backup pump, mounted near the tank to feed a mechanical pump on the engine, you'll probably never or only very occasionally ever hear it. Mart3406 http://www.jalopyjournal.com/forum/attachment.php?attachmentid=1116480&d=1286922690 =========================== <!-- / message --><!-- attachments --> <FIELDSET class=fieldset><LEGEND>Attached Thumbnails</LEGEND></FIELDSET>
Beside that fact that the '74 is way to new, 6 1/2 lbs is to much for that Edelbrock. Make sure you use a regulator on it and dial it down at least a lb. or so. And I'm wonderign what's wrong with a mechanical pump.
I don't have the answer you are looking for, but I have used a Holley Blue which was very noisy and a Carter, which is a bit more quiet but still annoying. No place on my 350 for a mechanical but that would be my vote.
Also easy to fab up a nice little sheet metal box or shroud for around the pump. Line the box with a sound deadener, a small piece of Dynamat or the like. You dont need a fancy brake to bend up some 18 or 20 gauge, just a vice, 2 pieces of wood 2 by 4 and a lil oomph. DONE. BDM Dont forget the rubber mounts and a good ground wire.
The problem is that when the pump is pumping and the motor doesn't need any fuel- pump is noisy, run pump free (like into a bucket) pump quiet, so solution is use a by-pass regulator, use same size line as to carb, also on the inlet and outlet of pump, use a short piece of flex hose and isolated mounts, should quiet the pump alot. For safty's sake I used push-lock hose & fittings for my flex line, you can get black, so it's more hidden.
I've found Carter street pumps to be the quietest of "performance" electric fuel pumps...some of it comes down to it's mounting arrangement. Many "performance" pumps have built-in bypasses. A Mallory pump will drive you crazy...even when rubber mounted...
Get that pump out of the cab! Main reason being, if you get a leak or have an accident, there will be pressurized fuel in the cab. Bad enough that the tanks in there with you.
I'm running a Holley Blue at the moment. Damn thing makes a real racket, and it started leaking on me and shut off completely recently. I just bought a Carter, which should hopefully work better. I can deal with noise, but I can't deal with unreliability. The Carter is a rotary vane style pump. Should be much quieter than the Holley
After several Holleys and an Aeromotive,I've been using a Bosch for a 12 cylinder BMW on my 502 for over two years with zero grief. I've still using the Aeromotive bypass style regulator. Quiet, too. OD
You don't need much of a pump to feed 300 hp. For what you are running a stock mechanical pump will give you all the fuel you will ever need. I'm going to guess that you have no provision for a mechanical? Mallorys by the way are noisey as hell. I like 'em but they are noisey as hell.
Like someone already posted. There is no need for an electric pump on a 300 hp SBC. Pick up a mechanical with a "better than stock" delivery spec and you'll be more than happy..............and no noise. Frank
Can't find the box or reciept. Think it's a Mercedes 12 cyl. pump though. The pump on my '73 Volvo looks the same. Probably any wrecking yard Volvo, BMW, Saab or whatever pump would work. Mine has a 13mm inlet and a 3/8" outlet. So does my old Volvo. New it was only $100 or so. The wrinkle is you need a return line and a bypass regulator . No thing. Keeps the fuel cool. OD
i recently used a little mr. gasket little pump from auto zone, cheap, bout 45 bucks, and pretty damn quiet.....was suprised.....came in several pressure too, think i got one the was 4and half to 5......cheap get me down the road deal....
Fords with EFi used external pumps for years. I converted a EFI car to carb and wanted to use the electric high pressure pump, but didn't have a regulator. I made a Tee fitting as shown to lower the pressure. The restrictor lets most of the gas return but keeps a bit of pressure at the carb. A 1/16 hole dropped carb pressure to 20psi, and a 1/8 to 13. It took a 11/64 to get to 8 psi, which is a fairly big hole. I suppose this is because as pressure drops in the pump, volume increases. The higher volume kept the pressure up. It's been working for years. Factory quiet.
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