Lotus Elan

Electric fuel pump install on a carburetor car

PostPost by: Enevand » Wed Apr 10, 2019 5:36 am

Hello,
I have decided to install a low pressure electric fuel pump https://bestarny.com/electric-fuel-pumps-for-carb/ on my Type3, for a number of reasons (vapor lock, the ability to prime my carbs after sitting for a long period, a cleaner look of the engine bay, the fact that you cannot find locally mechanical pumps, only electric ones and so on.).

Does anybody have pictures of an aftermarket electric pump installation? I am looking for ideeas of how to mount it below the fuel tank in a way that is both safe and does not require drilling any part of the car's body.

Thanks in advance.
Last edited by Enevand on Fri Apr 19, 2019 5:15 am, edited 1 time in total.
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PostPost by: nmauduit » Wed Apr 10, 2019 1:04 pm

fwiw, here is some photos on the setup recently installed on my street S4 : the pump is at the center next to the tank, it was first tried temporarilly with the stock nylon fuel hose (photo), then I installed a black braided teflon line for the pressurised section, direcly from the top of the pump (sorry no photo of the final result at hand).

img-20180906-03457.jpg and
temporary installation with stock nylon hose


I'm planning at a later point to build a shield, possibly a quarter of a cylinder, between the tank and the back of the diff. The pump is held by a bracket (iirc 1 hole in the trunk vertical wall) and a bit isolated from vibrations.
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PostPost by: crannyr » Wed Apr 10, 2019 1:20 pm

Here is what I did on my S4. The red switch on the left is a inertia activated fuel pump shut-off switch,
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PostPost by: UAB807F » Thu Apr 11, 2019 7:47 am

Hi,
I mounted a facet pump for similar reasons and fitted mine in the small space between the outermost side of the fuel tank and rear wing/bumper. In normal use you can't see anything because the boot carpet covers it.

I didn't want to drill the car body so I made a small wooden "L" to fit alongside the tank and mounted the pump on that. It means I can lift out the whole assembly if I want to and when in place it's covered over by another plywood panel & carpet, level with the top of the tank.

elan-electronic-fuel-pump001b.jpg and


Although it's a low pressure pump and supposedly designed for carburettors I also fitted a pressure regulator. That's currently at 2.5psi on the dial and it seems to work ok.

Brian
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PostPost by: rgh0 » Thu Apr 11, 2019 10:24 am

All modern electric pumps will lift fuel out of an Elan tank so mounting it above the tank in the recess over the diff between the wheel arches works also.

cheers
Rohan
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PostPost by: denicholls2 » Thu Apr 11, 2019 3:51 pm

UAB807F wrote:Hi,
Although it's a low pressure pump and supposedly designed for carburettors I also fitted a pressure regulator. That's currently at 2.5psi on the dial and it seems to work ok.
Brian


The pumps themselves, as the pictures show, are quite small. The other two pieces of hardware (inertia shutoff and regulator) will probably take up more space. People who don't fit a regulator see mixed results with Webers, which are overrun at about 3.5 psi input. Flooding results if your unit's output is above this number, and the available pumps seem to vary above and below it.

A single unit with regulated output and inertia shutoff would be just dandy. :)
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PostPost by: webbslinger » Thu Apr 11, 2019 9:33 pm

My pump is outboard of the tank similar to Brian's although I drilled holes through the wheel wells and mounted it on rubber dampers. I used an inline filter between the pump and tank, an inertia cut-off switch, and a pressure regulator.
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PostPost by: Elanman99 » Thu Apr 11, 2019 10:31 pm

UAB807F wrote:Hi,
I mounted a facet pump for similar reasons and fitted mine in the small space between the outermost side of the fuel tank and rear wing/bumper. In normal use you can't see anything because the boot carpet covers it.

I didn't want to drill the car body so I made a small wooden "L" to fit alongside the tank and mounted the pump on that. It means I can lift out the whole assembly if I want to and when in place it's covered over by another plywood panel & carpet, level with the top of the tank.

Although it's a low pressure pump and supposedly designed for carburettors I also fitted a pressure regulator. That's currently at 2.5psi on the dial and it seems to work ok.

Brian


My pump installation is virtually identical but my mounting method is much cruder! I just used a couple of lumps of upholstery type foam rubber and stuffed the whole lot down the side of the tank. Same pump although badged Bendix (fitted in 1969) and same regulator and setting.

I only recently put the foam 'mount' and I now miss hearing it when the ignition is switched on which was always reassuring as the sound changes when the float chambers are full (after not using the car for a month).

Ian
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PostPost by: nthSteve » Fri Apr 12, 2019 2:41 am

Howdy.

I used a Facet Gold-Flo 40002 (E) pump. It's a new version of the bigger round pump that ticks. Has pressure relief & anti-siphon valve, 1/8 NPT Female in & out. I mounted it on the RHS inner fender well, above the tank, with stiff rubber isolators. The bottom has a gasketed cap over the cleanable/replaceable filter. Here is a list of their pumps. I got the pump and spares from pegasus and aircraft spruce.

http://www.facet-purolator.com/tech-information/

It's worked very well, and was handy when I was draining the tank because the sender flange was leaking (which I cleaned up and put back with a thicker, viton gasket from Dave Bean, Hylomar Blue, and [longer] stainless button head cap screws).
-Steve, SoCal, '72 Sprint DHC
formerly Lotus 47, Lotus Cortina
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PostPost by: awatkins » Fri Apr 12, 2019 3:39 am

FWIW Facet Goldflow, previously known as Bendix Elmira pumps were used in Lamborghini 350/400 GT, Espada, Miura, etc without external regulators, all but the Miura having 40 DCOE carbs. The Miura used two pumps in parallel.
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