After eighteen years.....

[frearther]

After eighteen years of silence, I finally heard that lovely sound of a twin cam exhaust this afternoon. How lovely it is. [Applause]

Of course, now there's another problem. The new fuel pump (American type universal pump (I was in a hurry)) seems to have too much pressure. When the engine shut itself down - apparently from being too rich - fuel started dripping out of the carby mouths. My assumption is that this means that fuel pressure is too high.

Am I right, or might there be a different problem?

[type36lotus]

Congratulations!

Either that or the floats are sticking or the needle valves are shot. Some are viton rubber, some brass, if the former then that is good start. Did you rebuild the carbs first? Is your fuel pump mechanical or electric? I went the electric route, installed it in the boot (proper place) along with an inertia switch to power it down in case of an accident. At most local auto parts places you can find fuel pressure regulators, rather inexpensively. Again my preference is a low pressure electric (Solid state) fuel pump, which then dispenses with the FPR (one more thing to leak and its absence adds lightness).

[types26/36]

Could be that the pump has picked up a bit of dirt from the tank or the fuel line and this is not letting the needle seal on the seat, after 18 years there could be some corrosion in the tank or fuel line.
Try cleaning out the needles and seats and fit a filter before the carbs.

[ppnelan]

Check also that the chokes aren't stuck on....

Matthew

[oldokie]

I'm guessing that you've got Webers, they only need a pound or so fuel pressure, most american pumps( and SUs) deliver 5 to 7, I'd get a regulator for the fuel line.

[Meegulthwarp]

I got a Facet pump(can't remember which model) and it delivers around 10 psi, stuck in a regulator and brought it down to 3 psi. And i can increase it if i ever get the time and go full race spec.

[frearther]

My regulator should be here today. I'll post results as soon as we get a rainy day and I don't have to work in the garden.

[builder618]

The Webers take no more than 2-3 Lbs. In 1971 I fit a stewart warner electric pump and added an inline fuel regulator, everything was fine.
Car been siting since 74 ready to do it again, just less hair to protect my head.

[builder618]

The Webers take no more than 2-3 Lbs. In 1971 I fit a stewart warner electric pump and added an inline fuel regulator, everything was fine.
Car been siting since 74 ready to do it again, just less hair to protect my head.

[frearther]

Regulator's in - now it's just putting on the linkage after a good carb cleaning/rebuilding. I'm keeping my fingers crossed.