The Triumph Dolomite Club - Discussion Forum

I've been looking into why my auto Sprint's fuel consumption is 26-27mpg and recently saw Jeroen's comment about fuel pressure with electric pumps. I've measure mine and it is 3-3.5psi which is 0.2-0.25 bar, slightly above the maximum figure Jeroen quotes.

If I go back to a mechanical pump, I will first need to source a correct one. I've read quite a bit about ones being supplied with different arms that may or may not line up with the cam on the jackshaft, plus a question of spacers. As it is going to be couriered half way round the world, I an anxious make sure that I get the correct one! So the question is where can I get a correct one from?

The block came from a '75 Sprint with a chassis number just below 10,000.

Geoff

Can you not use a regulator to get your pressure where you want? Is this for webers? SU's run about 1.5psi

Tony

I have been running a electric pump for years with one of these http://www.ebay.co.uk/itm/Malpassi-Filt ... XQMmJRN3lb

Sprints being side draught dont suffer so much from fuel in the sump if the float valves cant cope.
If you are seeing 26-7 mpg on a Sprint auto I would say not a lot is wrong. You are bound to be looking at 10% less economy
on an auto over a manual car I would have thought.

Does it have other signs of running rich?

I have HIF's on my P6 which work fine with an electric pump. On the stag I did have too high pressure which overcomes the float valves and
caused oil dilution. The clue was the pump wouldn't stop ticking....and wasn't sucking air. So I fitted the pressure reg which means it now does stop
ticking.

If yours stops ticking at rest then chances are all is well.

Jonners