The Formula One race will be held on Sunday.
Alonso has yet to finish a race in 2017 and despite new upgrades for the Spanish Grand Prox he was only able to complete two corners in Barcelona before his vehicle failed again.
McLaren's team radio told him "stop the auto, stop the auto, engine problem" as a pool of liquid dripped from the underside of the vehicle.
The drip turned into a gush of yellowish liquid when a crane lifted the McLaren away from the track.
By then, Alonso was being ferried back to the paddock on the back of a scooter, past numerous local fans who had come to give the Spaniard a much needed boost.
"What can you do?" I'm sorry for the fans.
While that change was happening Alonso left the Barcelona circuit, went to his nearby hotel and shared a picture of himself playing tennis with a caption "Keeping the body active". He finished with the afternoon's slowest time, over three seconds behind pacesetter Lewis Hamilton. "I have had very little time in recent weeks to train with traveling etc so when they confirmed I had two hours free, instead of being here watching on television I went for some training".
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McLaren, the second most successful team in Formula One history in terms of race wins, have yet to score a point in four rounds of this year's championship and are last in the standings.
Asked by Motorsport.com about whether such input from an external party like Mercedes was now essential for Honda, Brown said: "I let Honda comment on all of their activities, but I think it is essential that Honda continues to revise their approach to get more power and more reliability in the back of their vehicle". But that is what Fridays are for.
"I drive to support the team, and drive as fast as I can, but the problem is not entirely mine".
Champion in 2005 and 2006, Alonso hasn't added to his 32 victories since winning the Spanish GP in 2013. I preferred to do sports, because I wanted to be ready if the auto was, said Alonso.
If Fernando Alonso's Month of May was meant to generate worldwide interest in the 101st Indianapolis 500, consider the early returns an overwhelming success.The live online coverage of. We've seen other engine manufacturers make significant progress over the season, as you saw with Renault a couple of years ago where they started and where they ended up. Hamilton lowered his own best lap time after lunch, with Bottas only 0.090 seconds slower.
Ferrari pair Kimi Raikkonen and Sebastian Vettel, who in reverse order took one and two at qualifying last round in Russian Federation, clocked the third and fourth fastest times less than half a second off Hamilton's pace.
"Sitting here today in Barcelona, it's hard to know when that will be other than we've designed lots of winning cars".