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ejt7777

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Reply with quote  #1 
Hi all,

I’m looking for some advice regarding the fuel system for my Cat.

It has a 1.6 pinto with twin 40 DCOEs, but is otherwise stock. The carbs are very closely coupled to the engine and look pretty, but if I’m honest are a massive overkill for the engine.

The fuel system comprises the tank, an electric fuel pump (unsure of brand, but sites adjacent to the tank), then pipework straight to the carbs. There’s no filter, pressure regulator, nor a fuel return to the tank (there is a return pipe in the engine bay which is just flapping about). Doesn’t feel that this is necessarily right(?)

I’ve had some trouble with hot starting, and have to rev to keep the engine going in traffic. Also, when I parked the car up in the garage, it stank the house out with petrol (and I mean stank it out - I could smell fuel upstairs in the opposite corner of the house!).

I’ve read about heat sink into DCOEs causing the fuel to expand, float levels to rise flooding the engine, etc. and am wondering if this is part of the problem, combined with lack of regulator or fuel return connection.

Any thoughts please?

Thanks
Ed


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TOC_Admin

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Reply with quote  #2 
Carbs don't need a return fuel line to the tank, so the unused return pipe should be of no concern.

Electric fuel pumps for carbs cut out when they hit a certain pressure in the line. Therefore, your issue sounds like the classic problem of the fuel pump overcoming the floats, and the resolution is to simply install an adjustable pressure regulator between the end of the fuel line and the carbs. This restricts the amount of fuel flowing to the carbs, whilst increasing back pressure on the fuel pump, causing it to cut out as necessary.

Whilst you're doing that, I would also recommend you install an inline filter between the tank and the pump. You can get transparent low pressure filters for a couple of pounds which allow you to easily see when they need replacing.
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ejt7777

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Reply with quote  #3 
Thank you for your reply - much appreciated [smile]

Can you recommend a particular adjustable pressure regulator/brand at all please? There seems to be a myriad of options available.

Cheers
Ed

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Carnoustiecat

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Reply with quote  #4 
Hi Ed

I use a Filter King on mine, this has a filter and a pressure regulator on it. Go for the one with the threaded bit to allow you to fit a pressure gauge to set it, only fit the gauge for setting the pressure, then remove and fit the blanking plug. From memory pressure for Webers should be about 3.5 psi.

Hope this helps.

Scott

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ejt7777

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Reply with quote  #5 
Hi Scott,

Thanks for the recommendation. Will re-confirm the fuel pipe bore diameters and order one from Demon Tweeks this eve [thumb]

Fingers cross that'll fix it!

Thanks both for your help - much appreciated.

Ed

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overdriver

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Reply with quote  #6 
I also had a very 'smelly Cat' - sometimes more noticeable the morning after a run but almost permanent whilst in the garage. It also seemed to be losing fuel through evaporation as the gauge would show a significantly reduced level if left for any length of time.

Replacing the flexi fuel line from the tank to the copper pipe (no electric pump) seemed to cure the problem. As you are going to insert a filter in that area, you may wish to consider renewing the fuel line if it's the original. Due to changed ethanol levels in modern fuels, earlier hose compositions become porous and need to be replaced with SAE J30 R9 or better (ensure genuine spec. from reliable source!).

Ideally, all of the 'rubber' fuel hose is best replaced including from copper pipe to carbs. In my case fuel sat in and basically corroded the lowest piece of hose.

Michael.

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Motobuild

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Reply with quote  #7 
I would say that twin forties on a standard 1.6 is overkill so I'd reckon she is flooding.fit a fast road cam.or smaller carbs maybe?!?!
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TOC_Admin

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Reply with quote  #8 
You can fit smaller chokes and jets to the carbs if necessary, there is definitely no need to get smaller carbs.

I also echo what Overdriver says about the fuel lines.  I run injection and had my high pressure line "blow" and sprayed petrol everywhere under the bonnet due to the fuel lines degrading - luckily, I was on the drive about to go out, so the engine was cold when it happened to me, so no risk of fire, but it could make a mess if the engine had been hot.

After fitting a filter and regulator, I would recommend getting it set up properly by a local specialist - I'm sure somebody local to you can recommend suitable places.



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ejt7777

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Reply with quote  #9 
Good shout Overdriver re:fuel lines - I stuck my head underneath the back this evening and one of the cotton braided fuel hoses is wet with fuel. I'll add a couple of meters of fuel hose to the Demon Tweeks order!

The plan for the winter is to fit the regulator and fuel lines, do an oil/filter/spark plug change, coolant flush and sort a woolly gear change (I'll start a separate discussion on that once I've had a look into it...) and SORN it until the spring. There's a rolling road just north of Derby that I'll use to set it up properly when it's coming out from winter hibernation [thumb]

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ejt7777

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Reply with quote  #10 
Quote:
Originally Posted by Motobuild
I would say that twin forties on a standard 1.6 is overkill so I'd reckon she is flooding.fit a fast road cam.or smaller carbs maybe?!?!


I agree, but that's what the car came with, so I'm going to try to make them work for me in the first instance. Besides, they'll come in handy if (when) I swap out the 1.6 for a 2.0...

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Carnoustiecat

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Reply with quote  #11 
Hi Ed  

If you're going to be flushing out your cooling system over the winter, while you're doing this I would have a good look at all the rubber hoses.
I don't know what year your car was built but mine had been built about 10 years when I got it and after a couple of cooling system leaks I decided to bite the bullet and replace all the hoses, never had a problem since, might be worth checking out for peace of mind.

Scott

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overdriver

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Reply with quote  #12 
Hi Ed,

Just pre-empting a future topic you may post, a 'woolly' gear-change is likely to be due to the original remote arrangement (a rose joint and 'flag-post' affair). If you use 'remote gear' in the search facility you will see a number of references to replacing the old unit. It might raise further questions so don't hesitate to ask.

Michael.



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Supercat, 2.0 Pinto, twin 45 DCOE Webers, Piper Ultimate Road cam.

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ejt7777

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Reply with quote  #13 
Scott, Michael - thanks for the tips, I really appreciate it.

The fuel system upgrades have been ordered from Demon Tweeks, so hopefully that’ll solve snag no. 1!

I suspect there’s going to be a whiff of Trigger’s broom about my Cat over the next few months...

Cheers
Ed

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