Thread: Stuee's 101 Rebuild

Originally Posted by 350RRC

Nice hoses......... Goodridge?

DL

The hoses are Brakequip made up by the hydraulic shop I go to. Good value and ADR approved etc so no issue when I take it over pits.

Brake Hose Manufacturing Systems, BrakeQuip Australia

Originally Posted by puma130tc

Ref. the leaking pipe on the carby, I'm fairly sure that's the overflow pipe, dumps fuel if the float valve in the carby sticks or doesn't quite shut off properly when the bowl is full.
This often occurs if sat around for a while, usually a tap on the body of the carby with a heavy plastic handled screw driver (the handle that is) will cure the problem.
These we're fitted with a plastic tube that exited the engine bay to the ground, however, if they get blocked up, you get fuel starvation problems when running under load, from memory.

Looks like this may be on the money. Started the engine today after becoming a yoga expert putting all the heater hoses in and the engine is running like crap. A bit of a play with everything and while its running I disconnect the fuel pump power and the engine all of a sudden starts running beautifully (till the carby starts running out of petrol). Plug it back in and it goes crap again and I can repeat this many times over.

From the behaviour of the engine and the flames shooting out the exhaust I suspect I've caused the system to overpressure which is causing the carbies to flood. To start the engine a second time when I turned it off before I figured out the fuel supply issue I had to crank the engine for quite a while before it would even fire making me suspect it was flooded.

Simple check is to de-solder the pipe I've sealed up and see if that makes a difference. I'm going to read up more on it tonight because its a bit late in the day to be running a v8 without mufflers

This might not work as I'm no petrol engine expert, but when a vehicle fitted with a carby runs rough, one of the first things the old garage man in the village servo where I used to live in the UK did was take the air intake pipes off, give the motor a good rev then slam his hands straight over the carby inlets, sucking any crap out of the jets. Worth a try b4 pulling the carbys down...

Originally Posted by stuee

From the behaviour of the engine and the flames shooting out the exhaust I suspect I've caused the system to overpressure which is causing the carbies to flood.

Simple check is to de-solder the pipe I've sealed up and see if that makes a difference. I'm going to read up more on it tonight because its a bit late in the day to be running a v8 without mufflers

Twin SU carbies ?

Fuel level is too high in the float bowl's, is there supposed to be a fuel pressure regulator on those V8's?
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Originally Posted by wrinklearthur

Twin SU carbies ?

Fuel level is too high in the float bowl's, is there supposed to be a fuel pressure regulator on those V8's?
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No regulators. I've looked through all the manuals and documents I have for the 101 and none show or indicate an overflow pipe so I believe it has been changed out at some point with another CD175. I've also checked a heap of pics of others 101's and not seen this particular pipe actually drilled out.

What I've read so far tonight is telling me that I've closed up the fuel bowl vent which is causing the issues. It may be that the passenger side carb also leaked when I had the blocked return line but I just never noticed. I think the picture below shows how the vent goes into the intake manifold rather than dumping on top of the engine.



This is quite a handy read (where I got the pic from):
TR250/TR6 Carbs Part I

A reference on venting on the club forum:
101 club • Login

Tomorrow I'll unsolder the vent valve and see what happens. I suspect now that the return line blockage is cleared it will not leak if I open up the vent line again.

Originally Posted by wrinklearthur

Twin SU carbies ?

Fuel level is too high in the float bowl's, is there supposed to be a fuel pressure regulator on those V8's?
.

No fuel pressure regulator required for the standard set up. The fuel circulates around back into the tank and keeps adequate fuel supply to the carbies.
As the fuel return is now blocked, maybe a fuel pressure regulator is now the solution?

I've fixed the blockage on the proper return line. I believe its as Peter pointed out to me, I may have actually blocked the fuel bowl vent line.

Another thought.

If the vent is blocked then as the fuel level increases in side the float bowl, there would be a slight pressure increase, forcing the fuel through where it is normally drawn by vacuum.

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