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It got 9.488% CO where it should have been under 3.500%. The HC was OK, 834 (Max limit 1200). The past few years it's been well under on both.(Mongoose from a Janspeed), but i wouldn't have thought that'd be the problem.- the limit may be 3.5% but it should be more like 1% if it's set up correctly. Also would expect HC to be much lower, that points to unburnt fuel. How's your MPG? Is the car running smoothly? causing high Mixture and big emissions.& it got CO 2.58% (strangely with a max limit of 4.5%, have they lowered it?) & HC of 170. For info it's been laid up over winter until about 5 weeks ago. It was the smaller of the two pipes in that area, possibly a return from the fuel regulator (the regulator looks new & shiny so probably after market). At the time i just pushed the rubber pipe and it's spring clamp back firmly over the rigid pipe. Could this have caused a problem? In the 4 years i've had the car (1st 2 years full bodywork restoration), the plugs, leads, dizzy rotar/cap have never been changed. I've never touched the mixture screw. I don't know where it is. Again i've never replaced any of the vacuum hosing, i assume it's original. It was driven about 12 miles to MOT station, so was nicely warmed up.(but that's no use as the MOT has run out, so not in the MR2), but live in Eaglescliffe. Don't run it too much (not that you will with no MOT) with it overfuelling to that extent, you're literally washing the bores with fuel. My Mk1 passed a couple of MoTs with a FSE FPR on it. 
Hi Tiny
1.
£4 each from Toyota £50 and if they ever go wrong they replace them for free for life £8 Dizzy Cap £20 New Oring £2 2.
Called Join in the fun. Below 3600rpm the ECU takes into account the position of the Mixture screw and its well worth making sure your screw is in the correct place. 
3.
about 2 hours work and £10-15 max.4.
The pipe that partially came off is the one on the right hand side at the bulk head. you can then get a link to post up If it's not the regulator will stay at a set pressure which is usually way too high. I'll have to look up which way raises/lowers the pressure but Cass will scan and post the destructions up tomorrow. & mixture screw, but i'm a bit cynical because they should be at the same settings as they were last year. Get the old fuel out the tank and put some new fuel in the tank Fresh tank of fuel and it passed the emissions test with no other changes