Ferrari's Kimi Raikkonen is back out and doing another short run, but he can't beat his leading his own benchmark this time around.

It's an early finish for McLaren, too, the team conceding that they're not going to complete the fuel pump change before the end of the session.

Lewis Hamilton hits his century of laps, but remains second on the timesheets, 1.331 seconds off the pace set by Kimi Raikkonen.

Romain Grosjean:, external Really good first feeling behind the wheel of the #E23 ! Looking forward to being in #Barcelona

Andrew Benson
Chief F1 writer

Image source, Getty Images

"Lotus's test is over because of an engine problem. 'It's a shame,' said trackside operations director Alan Permane. 'It's been going really well, especially as a week ago we did not even expect to be here.

"'The car is most definitely a big step forward over last year, even though we are still short of a lot of parts so it's not very representative. It's surprising we were running as quickly as we were given that. It's very encouraging - in fact, Romain was just saying that the car feels a lot like the 2013 car. He's a lot happier.'"

Short run for Ferrari's Kimi Raikkonen, who pitted after that flying lap.

Why haven't we seen Jenson Button for a while? Well McLaren say they've got a fuel pump issue which they're working on fixing now.

Image source, Getty Images

Ferrari's Kimi Raikkonen clocks a 1:20.841, which is the fastest time we've seen all week.

Red Bull send Daniil Kvyat out for another run, joining Lewis Hamilton, Marcus Ericsson and Felipe Massa. We've not seen Jenson Button and the McLaren for a while...

Image source, Williams

Williams:, external A quick stop for @MassaFelipe19 with a few front wing adjustments before heading back out

Here's how they stand:

1) Kimi Raikkonen (Ferrari) 1:21.516

2) Lewis Hamilton (Mercedes) 1:22.497 +0.981

3) Max Verstappen (Toro Rosso) 1:22.553 +1.037

4) Felipe Massa (Williams) 1:23.116 +1,600

5) Marcus Ericsson (Sauber) 1:23.551 +2.035

6) Romain Grosjean (Lotus) 1:24.300 +2.286

7) Daniil Kvyat (Red Bull) 1:24.300 +2.784

8) Jenson Button (McLaren) 1:27.660 +6.144

Image source, Reuters

With two hours to go, Lewis Hamilton heads back out. Will he hit a century of laps today after falling short on Monday?

Amin:, external Wondering what Alonso is thinking now seeing the Ferrari at top of the time sheets.

Lewis Hamilton pits, leaving Max Verstappen, Marcus Ericsson and Felipe Massa out on track.

Sauber:, external After finishing some set-up work, Marcus Ericsson is now doing aero scans. Good weather conditions!

Here's a snapshot of the day's headlines:

• Lewis Hamilton completes 78 laps, but his spin brings out the red flag

• McLaren and Jenson Button set their quickest lap of the week and clock 31 laps after a lengthy delay because of a "trivial issue" with the oil levels

• Red Bull miss much of the morning with an ERS issue but recover in the afternoon with Daniil Kvyat managing 35 laps

• Max Verstappen, Kimi Raikkonen, Marcus Ericsson and Romain Grosjean all complete more than 50 laps

• Marussia's hopes of competing in 2015 are boosted

• Force India say they will make the season opener despite delays with their new car

Today is the final day of the first pre-season test, but there are still two more to look forward to before the season kicks off in Melbourne with the Australian Grand Prix on 15 March. The second test begins on 19 February and then third follows on the 26 February. Both are in Barcelona and last four days.

Lewis Hamilton is still out on track, but he now has Daniil Kvyat and Marcus Ericsson for company.

Image source, Getty Images

It's been a tricky few days for McLaren, who are embarking on a new era with engine partner Honda.

"We have had a number of problems," said McLaren's director of engineering Matt Morris who met with the media earlier today. "We have had some operational issues - all of us working together as a team for the first time - things you take for granted when you have been with an engine supplier for many years.

"You drop the ball sometimes, like saying getting oil levels wrong and all these sorts of things. We have had a few issues like that. We have also had some minor electrical issues, which resulted in a lot of downtime but have actually been relatively easy to fix.

"The main thing is that we have not been burning bodywork or blowing up engines. I am pretty happy that we are going to come out of this test with no sorts of major issues to resolve."

Tom Clarkson
BBC F1 pit lane reporter

"On Tuesday, the visiting VIP was Red Bull owner Dietrich Mateschitz. For the final day of the test, McLaren have welcomed shareholders the Crown Prince of Bahrain and Mansour Ojjeh.

"The Bahraini royal family owns 50% of McLaren through its Mumtalakat investment fund, while Ojjeh, a long-time business partner of chairman Ron Dennis, owns 25%. Dennis owns the remainder. And, auspiciously, the car is working this afternoon so far."