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  #1  
Old 03-06-12, 13:36
andrew honychurch andrew honychurch is offline
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Default Fuel consumption and flow rate

Guys, I have opted to fit an electric fuel pump on the T16 as the NOS fuel pump diaphrams will not stand up to the ethanol in the fuel.

I have fitted a an electric pump I had off a Range Rover 3500cc V8, however whilst I can get the correct pressure through my regulator, about 3.5 psi, it does seem to be a little short of fuel.

Question is therefore, does anyone know what Gallons/hour the Mercury 100hp engine will use? I guess in simple terms if the T16 does 4 mpg, and the Range Rover does 16 mpg, maybe it is not man enough for the job. Thoughts gratefully received. thanks Andrew
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Old 03-06-12, 13:54
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Andrew I would have thought the rangerover pump would have been more than up to the job... Have you plumbed in a return feed from the reg back to the tank ? Failing that type in Facet fuel pump in eBay and fill yet boots matey
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Old 03-06-12, 14:11
andrew honychurch andrew honychurch is offline
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Having Googled the RR pump, which is a Facet as it happens, it looks to be rated at 18 gallon/hr, whereas some of the Facet pumps, red top etc, reach 40 gallons/hr.

I have not arranged a return feed to the tank, not sure whether it is necessary as I have a Filter King regulator which limits the fuel flow and reduces the tendency for the pump to overcome the float bowl needle.

Anyway, David Gordon, Horsa, has not arranged a return to my knowledge. Why do you think I need one Richard??
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Old 03-06-12, 14:21
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Jordan Baker Jordan Baker is offline
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Why not buy a new diphram for the original fuel pump and then place a marine outboard fuel primer bulb in the fuel line. I used this very successfully with my carrier. Give the bulb a few squeezes and it fills the carb right up. I found it easier then messing around with an electric fuel pump
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Old 03-06-12, 14:37
andrew honychurch andrew honychurch is offline
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hi Jordan, the only reason I have opted to go electric is the lack of supply of original equipment diaphrams in ethanol resistent material. My experience of using NOS items is that the ethanol turns the material to black goo. Which fills up the carburettor with gunge and fails to produce fuel supply. The secondary effect is to allow fuel to feed into the sump, diluting the oil and running the mains!!! May I am wrong, but electric seems easier, and when you have a T16 stuck on the side of the road with fuel supply problems its an expensive recovery operation!
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Old 03-06-12, 15:01
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Are you looking for wartime fuel diaphrams? If so I can't think you will find them. I used an original fuel pump on my carrier but easily replaced the diaphram with a new made one from Macs Antique Auto parts. I would think any online vintage ford parts dealer would stock these
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Old 03-06-12, 14:55
Phil Waterman Phil Waterman is offline
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Default Problem with marine primer bulb

Hi

Been reading this thread with interest as the increasing levels of ethanol in gas is a problem. In the USA they are looking at going from 10% to 15% which I fear will lead to a new round of problems.

In the US they had to change the Marine Primer Bulb composition a couple of years ago as at that time marine gas didn't have ethanol and vehicle gas did. There was a round of problems caused by people filling their boat tanks at the local gas station. So if you are going to add a primer bulb be sure to check that it is rated for ethanol.

I have discovered one other problem with marine primer bulb connected in line with electric fuel pump. Testing engines on the test stand I discovered that if the bulb doesn't get completely purged of air that the electric fuel pumps may not be able to suck the fuel through because of the cushion effect of the air and the rubber bulb is just enough to absorb the individual strokes of the electric fuel pump. Once the bulb is purged of air this problem seems to go away. Found the problem by putting a combination fuel pressure and vacuum gauge on either side of the bulb to note the difference.

A higher flow electric or mechanical probably would not have this problem.

Wasn't there an electric fuel pump that was used in some of the Ford CMPs to help cure some fuel supply and vapor lock problems?

Cheers Phil
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  #8  
Old 03-06-12, 15:07
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Andrew just in the past I have used them so the fuel delivery stays at correct pressure you have mentioned an adjustable reg so it's in the realms of the unknown for me, I had a mini turbo which needed 3.5psi constant for fuel, the reg was a standard item none adjustable so issues sometimes occurred where the engine idled fine but under load it would be starved of fuel,,,, the fix was to use a return feed and the delivery fuel lines were not to have a diameter less than 8mm
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__5th Div___46th Div__
1942 Ford Universal Carrier No.3 MkI*
Lower Hull No. 10131
War Department CT54508 (SOLD)
1944 Ford Universal Carrier MkII* (under restoration).
1944 Morris C8 radio body (under restoration).
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  #9  
Old 03-06-12, 19:43
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Hanno Spoelstra Hanno Spoelstra is offline
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Quote:
Originally Posted by Phil Waterman View Post
Wasn't there an electric fuel pump that was used in some of the Ford CMPs to help cure some fuel supply and vapor lock problems?
Yes, the Autopulse, it was standard on Indian Army CMPs. Read more here on its purpose and operation.

Hanno
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