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The quietest electric fuel pump for twin carbs ?


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6 minutes ago, halboyles said:

I've always had good luck with the Carter version:  https://www.summitracing.com/parts/crt-p60504

 

Rock solid and fairly quiet.  

 

i have the same one and have been happy with it.  you hear a slight hum, but its not noticeable once the engine is running.  if i was doing it again, i would rubber mount it instead of directly bolting it to the car.

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Rubber mounting a rotary style pump will be the quietest, Carter and Holley are the easiest to find and will work very well.  Make sure you get a good fuel pressure regulator, you only need 2.5-3psi and the pumps usually put out 6-7psi. 

1970 1602 (purchased 12/1974)

1974 2002 Turbo

1988 M5

1986 Euro 325iC

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9 hours ago, Preyupy said:

Rubber mounting a rotary style pump will be the quietest, Carter and Holley are the easiest to find and will work very well.  Make sure you get a good fuel pressure regulator, you only need 2.5-3psi and the pumps usually put out 6-7psi. 

(6-7 psi and the regulator restricts the flow

to 2.5-3psi) does this cause the pump to be louder ?

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I've used these Pierburg electric fuel pumps with carburetors many times. These have the correct fuel pressure already, so no pressure regulator required. And yes, they're quiet, as long as you use a rubber mounting bushing. I just recommend wiring in a safety relay of some sort. I personally like the VW Rabbit one that already has a ATC fuse holder built in. All it needs is a RPM signal.

http://www.autohausaz.com/search/product.aspx?partnumber=90160810600

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Edited by tjones02

Tom Jones

BMW wrench for 30 years, BMWCCA since 1984 at age 9
66 BMW16oo stored, 67 1600-2 lifelong project, 2 more 67-8 1600s, 86 528e 5sp 586k, 91 318i
Mom&Dad's, 65 1800TiSA, 70 2800, 72 2002Tii 2760007 orig owners, 15 Z4 N20

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6 hours ago, gary said:

(6-7 psi and the regulator restricts the flow

to 2.5-3psi) does this cause the pump to be louder ?

 

Not that I have seen, their internal pressure regulators (blow off valve like an oil pressure relief valve in your engine) is already open so it just flows a bit more.  You have to remember there is not much flow into the carburetors at anything less than wide open throttle in the upper RPM range. The carburetor float inlet valve is closed more than it is open.

1970 1602 (purchased 12/1974)

1974 2002 Turbo

1988 M5

1986 Euro 325iC

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You can find the Carter for around $34:  https://autoplicity.com/333952-carter-p60504-fuel-pump?1&gclid=Cj0KEQjw8tbHBRC6rLS024qYjtEBEiQA7wIDebrpcNgHZAE0oURT1vtRn4RwhurvSQVxEL3rKcPpp3caAsfy8P8HAQ

 

Since this model is rated for no more than 4 psi, you might be able to get by without a regulator.  I have on Solex and Weber downdraft and sidedraft setups.

BMWCCA  Member #14493

www.2002sonly.com

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I'm on the Carter 4 psi pump band wagon.  I hung mine in line, above the diff., inserted it into the rubber line that feeds the metal return line on my '75.  I drilled one small hole and used a rubber isolater from amazon to try and eliminate as much transfer of vibration to the body as possible.  Used the Tii pump power feed under the dash and ran a single power wire to the pump. Grounded it under the isolator to complete the circuit. 

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2002 newbie, and dead serious about it.
(O=o00o=O)
Smart Audio Products for your 2002

 

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18 hours ago, tjones02 said:

I've used these Pierburg electric fuel pumps with carburetors many times. These have the correct fuel pressure already, so no pressure regulator required. And yes, they're quiet, as long as you use a rubber mounting bushing. I just recommend wiring in a safety relay of some sort. I personally like the VW Rabbit one that already has a ATC fuse holder built in. All it needs is a RPM signal.

http://www.autohausaz.com/search/product.aspx?partnumber=90160810600

IMG_1020.JPG

Perhaps you didn't understand my post

the one your recommending IS the one

i have and it is loud

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the stock mechanical pump with oem regulator works perfect on my 40's dellortos on a relatively stock motor.

 

otherwise i honestly dont understand why changing.

2006 530xi, 1974 2002 Automatic summer DD
1985 XR4TI, 22psi ±300hp
1986 yota pick-up, 2006 Smart FT diesel

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5 hours ago, gary said:

Perhaps you didn't understand my post

the one your recommending IS the one

i have and it is loud

Well, how did you mount it? Did you use a rubber bushing between the clamp and body?

 

Tom Jones

BMW wrench for 30 years, BMWCCA since 1984 at age 9
66 BMW16oo stored, 67 1600-2 lifelong project, 2 more 67-8 1600s, 86 528e 5sp 586k, 91 318i
Mom&Dad's, 65 1800TiSA, 70 2800, 72 2002Tii 2760007 orig owners, 15 Z4 N20

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I have this one, and it's like having a meat grinder in the trunk.

 

I love it.  It's mounted directly to the rear bulkhead for extra resonance.

 

I can tell when there's junk in the tank, because I can hear the pump grinding it up.

 

Mwahahahahah.....

 

t

...not srs

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"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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