Lotus Elan

Electric Fuel Pump Installations

PostPost by: Famous Frank » Fri Jan 16, 2015 1:31 am

I'm about to install an electric fuel pump in the boot along with a fuel filter. Does anyone have pictures of their electric pump installations? If so, please post the pics. I'm looking for ideas on where to locate my components.. I can't use a manual pump as my engine's jack shaft has been machined down to only drive the distributor. I plan on using a Carter pump P4070 which is suppose to put out 4 - 6 pounds of pressure which I've been told is compatible with Weber Carbs. I'll also be using a fuel pressure regulator, a fuel gauge, and a fuel filter with stainless steel braided teflon fuel hose and AN fittings.

Thank you, Frank
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PostPost by: Certified Lotus » Fri Jan 16, 2015 9:21 am

Frank, this is the install that is currently in my car (and the same as what I am sending you when I pull it out later this winter). Although it's a race fuel cell, you can see the mounting of the rather large fuel filter and the electric fuel pump. If you look closely you can also see the pressure regulator.
L1140205.jpg and

L1140206.jpg and

L1140207.jpg and
Last edited by Certified Lotus on Sat Jan 17, 2015 2:28 pm, edited 1 time in total.
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PostPost by: TroonSprint » Fri Jan 16, 2015 2:08 pm

I don't suppose there is a right way or wrong way. I have used a Webcon pump which is specifically for use with Weber carbs. It is meant to be at or near the bottom of the tank, so I found it fit nicely in the space in front of the spare wheel platform, as you can see in my photo. The spare wheel still fits without interfering with the pump.

The blue unit is a cut-off valve which needs power to be open (although it has a manual lever as well), and the black relay is from a VW car. It has a wire from the coil to it and only operates the pump if there are ignition pulses, so if the engine stops, the pump also stops. The red push button allows me to manually over-ride that relay for priming of the carbs if the float chambers are empty.

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PostPost by: nomad » Fri Jan 16, 2015 5:37 pm

How about an inertia switch to shut off the pump when you guys hit a tree! :D

Knew a guy that was cremated in an early MGB. :shock:

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PostPost by: TroonSprint » Fri Jan 16, 2015 6:59 pm

Hopefully a front collision will stop the engine, and on my car that would stop the pump. I have an inertia switch on my MGB V8.

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PostPost by: prezoom » Fri Jan 16, 2015 9:09 pm

Frank,
My Facet pump is located similar to Glens, just a little more around to the right You may want to use some rubber isolators between the pump and the body. The shell acts like a sounding board without them. The isolators reduce the sound significantly.
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PostPost by: nomad » Sun Jan 18, 2015 2:19 pm

The Facet cubes are notoriously noisy. There are quieter and just as reliable pump's out there. Facet offers a pump that used to be made by Bendix that is a cylinder with a dome on the top and a removable filter on the bottom....can't remember what they call it. Anyway, I had the Bendix that they apparently acquired on an MGB that is still on the road and owned by a friend. That pump has been in operation since the mid 1960's and over 120K miles and is still going strong. Not noisy either.

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PostPost by: RotoFlexible » Sun Jan 18, 2015 6:30 pm

Frank,

Here are two photos of my Carter installation. I've since added a regulator (inexpensive dial type) in the hose between the pump and the connector to the line that runs to the front. The electrical connections to the Carter are a bit strange - they don't seem very secure, but they haven't come loose. The pump is definitely noisy. I think the bracket is mounted solid to the fiberglass, with no rubber isolation. I can just fit the spare tire in the remaining space, and I use a small wooden block to keep the tire from banging into pump and regulator. (I lost fuel pressure once because the tire "adjusted" the regulator to 0 psi!)

I also replaced the plastic line through the chassis with a steel brake line.

Hopefully this thread will convince me to fit an inertia switch. It's always been one of those "I'll get around to it" items.
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IMG_1201 (800x600).jpg and
IMG_1202 (800x600).jpg and
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PostPost by: prezoom » Sun Jan 18, 2015 6:48 pm

Mine is the round type and was still noisy in my opinion without the isolators. Now I can only barely hear it over my ever present deteriorating hearing, before moving the ignition switch from the run to the start position. With the engine running, it cannot be heard or felt. I do carry a small cube type as an emergency spare, equipped with the needed hose barbs and electrical connectors, for a quick repair if needed. Just an unplug/plug quick fix. Just use a tyrap to fasten it to the existing pump.

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PostPost by: nomad » Mon Jan 19, 2015 3:05 am

I've fitted 2 "Airtex" recently just because they were cheap. [notorious cheapskate here!]
They seem to be good pumps so far and are not noisy either.

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PostPost by: billwill » Mon Jan 19, 2015 11:33 am

prezoom wrote:
"Roun2its" are the most elusive tasks/objects in the restoration process.



There are plenty of Round Tuits on the Internet, pick one, print it out and Bobs your uncle.
https://www.google.co.uk/search?q=round ... 64&bih=696

I'm going to print myself one in the near future, as soon as I get around to it.
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PostPost by: Quart Meg Miles » Mon Jan 19, 2015 12:47 pm

There have been several threads on this in the last couple of years, shame on you Frank for not searching them like I did with "Fitting an electric fuel pump".

Here's one of them which includes a couple of pictures, on page 2, of my installation (of Facet) and Alex Black posted a number of pictures in a similar thread.

lotus-carbs-f40/vapor-lock-think-t29160-15.html

I have, since, moved the regulator into the engine bay and after the mechanical pump. The electric pump cured all the vaporisation problems that I had been suffering from since the advent of alcohol in the fuel (which isn't relevant to Frank's requirement). Mounted on rubber I can't hear the pump while running the engine unless it is fighting vaporisation.
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PostPost by: Galwaylotus » Tue Jan 20, 2015 2:57 pm

My installation is the same, schematically, as Mike's (TroonSprint) except I don't have the the cut-off. In summary, fuel tank > filter > pump > regulator > carburettor inlet.
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