SR3 Fuelling Problem ??
Discussion
I was at Spa for 2 days last week and at the top of Eau Rouge the car suddenly started to splutter as if there was no fuel. I managed to coast it at a constant 3k rpm all the way to the top opf the kemmel straight but as soon as I downchanged and gave it some more revs there was nothing. Got towed back in a re-fuelled and it started fine so i thought it must have been because I was out of fuel. Went back out and then after 4 laps, it did the same thing again. Radical said it could be the fuel pump coming off it's mounts and sitting horizontally (had a look and it is fine), they also said it could be the fuel regulator but how do I test that ? Can anyone help, I fired it up in the garage yesterday and it was fine so it's an intermittent problem but I guess it could be one of 4 or 5 things ???????
Also what gearing do people use around Spa, I had the standard gear in and it was awful, I was running out of puff a third of the way up the kemmel straight and also before Blanchimont 1 ?
Also what gearing do people use around Spa, I had the standard gear in and it was awful, I was running out of puff a third of the way up the kemmel straight and also before Blanchimont 1 ?
http://www.radicalmotorsport.com/racing04/gearing....
For the grearing
I had problems with my fuel system, You need to strip the system and check the fuel filter is clear (Mine was nearly blocked by tank foam particles) that the low fuel pump is working and flowing fuel and that the high pressure pump is doing the same. It's all behing the LH side pod which is no too difficult to get off
Hope this helps
Simon
www.tillingmotosport.com
For the grearing
I had problems with my fuel system, You need to strip the system and check the fuel filter is clear (Mine was nearly blocked by tank foam particles) that the low fuel pump is working and flowing fuel and that the high pressure pump is doing the same. It's all behing the LH side pod which is no too difficult to get off
Hope this helps
Simon
www.tillingmotosport.com
Hi Simon,
I have the bullet type fuel filter on mine which is in the engine compartment just near the battery. I took it off yesterday but it seems like a sealed unit so you can't get to the filter element,(it's the blue Sytec one like on the Radical on-line store). I blew through it and it did not seemed to be blocked. Also, I didn't realise there were 2 pumps, I thought there was only the one pump in the tank, is there another next to the regulator inside the side pod ?
If so, how do you check they are working properly ? I fired it up again yesterday and it seemed fine.....could it be an electrical thing ? Thanks, Ali.
I have the bullet type fuel filter on mine which is in the engine compartment just near the battery. I took it off yesterday but it seems like a sealed unit so you can't get to the filter element,(it's the blue Sytec one like on the Radical on-line store). I blew through it and it did not seemed to be blocked. Also, I didn't realise there were 2 pumps, I thought there was only the one pump in the tank, is there another next to the regulator inside the side pod ?
If so, how do you check they are working properly ? I fired it up again yesterday and it seemed fine.....could it be an electrical thing ? Thanks, Ali.
The bullet one does come apart, the red bit unscrews. Merlin Motorsport sell the filters for them.
To check the low pressure pump you can undo it and put a pipe into a measuring container. It should do around .75 of a litre per minute. The high pressure pump can be tested the same way but it will do about 2-2.5litres per minute. You can also put a pressure gauge in the line to the throttle bodies, it should be around 45psi (~3bar)
To check the low pressure pump you can undo it and put a pipe into a measuring container. It should do around .75 of a litre per minute. The high pressure pump can be tested the same way but it will do about 2-2.5litres per minute. You can also put a pressure gauge in the line to the throttle bodies, it should be around 45psi (~3bar)
Hi Rob, I did wonder if the red bit came off as it looked like it should but I couldn't twist it, will have another go. If it was a fuel pump problem, surely it would either work or pack up altogether, unless it's a wiring thing.
Whenever I fire the car up now, it runs perfectly. Maybe it could be the regulator playing up but I guess you can't test that.....if the fuel filter turns out to be clear, I am lost. Radical suggested it could be the ECU getting too hot as it sits right behind the manifolds...lot's of could be's. As it is intermittent, i guess it's electrical or something in the filter that gets stuck every now and then. Any more suggestions welcome ?
Cheers
Whenever I fire the car up now, it runs perfectly. Maybe it could be the regulator playing up but I guess you can't test that.....if the fuel filter turns out to be clear, I am lost. Radical suggested it could be the ECU getting too hot as it sits right behind the manifolds...lot's of could be's. As it is intermittent, i guess it's electrical or something in the filter that gets stuck every now and then. Any more suggestions welcome ?
Cheers
Not forgetting that I am really new to Radicals, if they are still on yours, might the problem be those hideously 'wobbly' spark plug leads with those useless 'pontefract liquorice' gaskets at the top? We're replacing them with the new 'properly rubber finned tight sit-in' Magnecor leads this weekend: with our Hayabusa engined SR4, we had a similar intermittent 'come and go' annoyance at Silverstone three weeks or so ago (going like an absolute dream, then for no apparent reason a patch like someone had 'pulled the plug', then just as unexpectedly and inexplicably back on full sweet song again) and I think (and hope!)that was what our problem was: I subsequently spoke to the guys at Radical and I got the impression that they had a heck of a lot of grief because of those old 'wobblies' and seemed very pleased indeed that they have finally got Magnecor to produce something 'proper' which seems to have finally solved the problem.
Radical suggested that the leads might be the problem with mine but then it would still fire on 3 cylinders if one lead had a poor connection so it can't be that. Mine splutters abd then dies completely so it has to either be a fuelling or an ECU problem I reckon, taking the filter apart this afternoon, see if I have any joy there. Will keep you posted if I find the solution.
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