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Author Topic: Fuel pump  (Read 2748 times)
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dannels
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« on: 28 October, 2014, 12:34:12 PM »

Hi All,

I'm having reliability issues with my recently rebuilt mechanical fuel pump - i'm not sure if its air in the system or the pump is just too weedy...or both

I'm considering adding an electric fuel pump - but have a few questions...

What type do people recommend - Faucet silver top with a pressure regulator?

Where do people position the pump? If its in the boot/near the fuel tank then it only pumps one of the two fuel lines - so do people site them in the engine bay?

All words of wisdom appreciated...

Cheers
Dave

 

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Jay
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« Reply #1 on: 28 October, 2014, 02:17:00 PM »

Hi Dave

The 3C had an electric pump in the rear n/s wing compartment, one that has the filler tube in, it then pumps a loop/return system with a Filter-king type glass filter and regulator in the engine bay.  Not sure how the pump and plumping has been set-up in the boot, as I spend more under the bonnet, but can have a look later.     
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Julian Wood, Kingston, London
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« Reply #2 on: 28 October, 2014, 03:23:19 PM »

Hi Dave

The Berlina has an electric pump in the boot br the filler pipe too.

Frank
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dannels
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« Reply #3 on: 31 October, 2014, 02:55:15 PM »

I'm still not clear how a pump in the boot can pump both pipes from the fuel tank or is it just pumping the main not the reserve?

On another note I've gone for electronic ignition and have got myself completely confused when I removed my distributor cables. I took a note when I removed them of their position, but then looked at the workshop manual that gave a firing order of 1-4-3-6-5-2 - which is different from how I had it set up before....

My previous set up had 1-5-3-2-4-6 which is firing one side then the other - was this incorrect?? Is the workshop manual correct for all models? It also lists the order of the cylinders on each bank which seems different from mine (looking at the number stamped next to the plug)
From front to rear - on the right I have 1,3,5 and on the left 6,2,4

Can someone set me straight please?

Cheers
Dave





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Jay
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« Reply #4 on: 31 October, 2014, 03:53:06 PM »

Hi Dave

It also doesnít help that the dizzy cap has the firing order stamped on it whilst the cylinder heads are the cylinders numbers. This doesnít mean that the HT leads are set out as 1 goes to 1, 2 goes to 2, etc. as that would give you a nasty misfire.  But what I do remember is that it is close but you have to swap 2 of the 6 HT cables around.

I donít have any documentation at work but have it written down at home so will post tonight, also I will have a look at fuel pump over the weekend when itís light.

My weekend job is splitting the gearbox, when I took the transaxle out I tested box by turning the input shaft in each gear including reverse, counting the output shafts rotations, it seemed smooth and fine. So rebuilt the clutch, brakes etc however when putting the clutch back on I was turning the input shaft and then realised it was in gear and discs were on blocks, so why was I able to turn the shaft?

My only conclusion is either the gear on the input shaft or front gear on the main lower shaft is spinning on their shaft.      
« Last Edit: 31 October, 2014, 10:04:14 PM by Jay » Logged

Julian Wood, Kingston, London
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« Reply #5 on: 31 October, 2014, 05:48:22 PM »

Thanks!

You need to try with the wheels on and on the ground. If it still turns when you are in gear then it's an issue. Turning when there's no weight on them is normal.

Cheers
Dave

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Richard Fridd
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« Reply #6 on: 31 October, 2014, 07:20:51 PM »

I'm still not clear how a pump in the boot can pump both pipes from the fuel tank or is it just pumping the main not the reserve?

On another note I've gone for electronic ignition and have got myself completely confused when I removed my distributor cables. I took a note when I removed them of their position, but then looked at the workshop manual that gave a firing order of 1-4-3-6-5-2 - which is different from how I had it set up before....

My previous set up had 1-5-3-2-4-6 which is firing one side then the other - was this incorrect?? Is the workshop manual correct for all models? It also lists the order of the cylinders on each bank which seems different from mine (looking at the number stamped next to the plug)
From front to rear - on the right I have 1,3,5 and on the left 6,2,4

Can someone set me straight please?

Cheers
Dave






I am also not clear about how a single pump would provide delivery to both fuel and reserve pipes? Here is my setup from the "Flaminia" thread


* pump.jpg (30.89 KB, 640x480 - viewed 293 times.)
« Last Edit: 31 October, 2014, 07:31:50 PM by Richard Fridd » Logged

Richard Nevison Fridd
Jay
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« Reply #7 on: 31 October, 2014, 09:21:48 PM »

HT setup, as mentioned above the numbers on the dizzy are the firing order

Looking at the engine with fan nearest you the cylinders are numbered

6       5
4       3
2       1
   Fan

So the HT leads are connected as follows, with the dizzy #1 roughly at 1 oíclock position and going clock wise 

Dizzy      Cylinder
1     to      1
5     to      5
3     to      3
2     to      4
4     to      6
6     to      2

But will double check this over the weekend.

Regarding the gearbox itís still out the car, but i can turn the input shaft with the discs stationary in all gears, so must be a major problem.
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Julian Wood, Kingston, London
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« Reply #8 on: 01 November, 2014, 08:51:43 AM »

Thanks Julian,

I can see where the confusion is happening - (apart from the manual!)- my cylinders are stamped as follows:

4.    5
2.    3
6.    1

Fan

Cheers
Dave
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« Reply #9 on: 02 November, 2014, 09:45:35 AM »

Thanks Richard,

Do you recommend the faucet pump? Where is it connected - to the main fuel line?

Cheers
Dave
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« Reply #10 on: 02 November, 2014, 10:30:49 AM »

Yes.In the main fuel line with pressure regulator.
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Richard Nevison Fridd
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« Reply #11 on: 02 November, 2014, 12:35:50 PM »

Isn't it that the distributor cap simply has the firing sequence of the cap on it? And The cylinders are numbered on the heads.

You put the two together as needed (per the manual with the firing order. The confusion is that people expect the dist cap to be numbered as the firing order (for the cylinders) which it is not. If you take the dist cap off and check it from below, this becomes clearer.
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« Reply #12 on: 02 November, 2014, 03:45:03 PM »

The confusion is the manual states a certain firing order but the cylinder numbers are not necessarily the same on each car... Mine are stamped differently than Jays for example
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1961 Flaminia GT, 1966 Matra Djet V
Jay
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« Reply #13 on: 02 November, 2014, 04:46:37 PM »

Moving on to fuel pumps, I have a facet ( i guess itís a silver top) mounted on the inner wheel arch on looks like the original rubber mounts. There are 2 metal pipes that pop through the boot floor, the rear comes from the tank and is plumbed into the bottom Ďiní of the pump and the front comes from the Ďoutí, which goes to the engine bay regulator.

In the engine bay it passes through a Filter King type filter and regulator and then off to the centre carb banjo, its the pipe in the forground of the picture.

So no return system.......    


* engine bay.jpg (431.01 KB, 1340x1005 - viewed 172 times.)

* fuel pump.jpg (467.3 KB, 1336x1002 - viewed 202 times.)
« Last Edit: 04 November, 2014, 09:10:20 PM by Jay » Logged

Julian Wood, Kingston, London
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« Reply #14 on: 02 November, 2014, 05:14:42 PM »

Nce carbs. I now understand how the fuel and reserve pipes function, with a pump being mounted at the front of the car, thank you.
« Last Edit: 03 November, 2014, 04:26:57 PM by Richard Fridd » Logged

Richard Nevison Fridd
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