Banga Posted December 22, 2014 Share Posted December 22, 2014 Got my single 40 sidedraft Bolger up and running tonight, idles and revs mint but ran into an issue when I took it for a drive. Fine on the flat but died when going up a hill, got home and pulled the floats out and seemed to be way off so adjusted those to approx 15mm with the 7 gram floats I have, and went for another hoon and while it was a little better it still died eventually- died as in completely stalled. Seems like a fuelling issue to me, could too much fuel pressure cause that? I'm waiting for my regulator to turn up, current electric fuel pump set up was fine on a 32 dfm weber. Quote Link to comment Share on other sites More sharing options...
Banga Posted December 22, 2014 Author Share Posted December 22, 2014 The carb came off a 1600 crossflow so should be in the ball park jetting wise. Quote Link to comment Share on other sites More sharing options...
shaneo Posted December 22, 2014 Share Posted December 22, 2014 I had an issuse with my side drafts running out of gas as well . Fuel pump set up was enough couldn't work it out . Picked Murrays brain from webber spec and found out that my neddle (value) jets where 1.5 which is a pretty standard size in side draft carbs . He machined them out to 2mm for me problem solved better fuel delivery . I might be wrong but from memory that was what it was correct me if im wrong Quote Link to comment Share on other sites More sharing options...
bigmatt4 Posted December 22, 2014 Share Posted December 22, 2014 I had the same issue going up the kaimai ranges on my 1600 with twin 40s uprated to 2.5mm needle and seat also had a restriction in the brass fittings i used upgraded them and its all good. What pump are you using and where is it located Quote Link to comment Share on other sites More sharing options...
shaneo Posted December 22, 2014 Share Posted December 22, 2014 A factory pump should give enough gas. I run on 10mm line instead of 8mm and I have a 1-4psi pump in the boot to help get the gas up the front havent run out yet for twin 45s Quote Link to comment Share on other sites More sharing options...
Banga Posted December 22, 2014 Author Share Posted December 22, 2014 I had the same issue going up the kaimai ranges on my 1600 with twin 40s uprated to 2.5mm needle and seat also had a restriction in the brass fittings i used upgraded them and its all good. What pump are you using and where is it located Looks to be a Goss universial (was on the car when I bought it) which is meant to flow up to 110L per hour, it's mounted in the engine bay, about a metre of 8 mm fuel line to the carb. I'm going to throw on a new fuel filter to eliminate something cheap and then will take a look at the needle after that. cheers guys. Quote Link to comment Share on other sites More sharing options...
azzurro Posted December 22, 2014 Share Posted December 22, 2014 was the 1600 it was off running a single sidey too? if it was running twins then the jets will be too small when its supplying 2x the cylinders. if your pump was ok with a downdraft it should be fine with sidey(s), they shouldnt use that much more gas. does it run fine if you ease off a bit? ie the fuel supply fills the bowl up again, or is it dead for while? I would pull the carb off and give it a good clean out and tidy up (and note the jets/tubes etc sizes for later!) before chasing more complicated things. Filter is a good idea but wont be a fix for what currently ails ya Quote Link to comment Share on other sites More sharing options...
bigmatt4 Posted December 23, 2014 Share Posted December 23, 2014 Looks to be a Goss universial (was on the car when I bought it) which is meant to flow up to 110L per hour, it's mounted in the engine bay, about a metre of 8 mm fuel line to the carb. I'm going to throw on a new fuel filter to eliminate something cheap and then will take a look at the needle after that. cheers guys. try moving the pump to the back most electric pumps are a push pump so they are designed for pressure not vacuum had the same on a customers hq with 350 run out of fuel at full throttle moved the pump to the back solved 1 Quote Link to comment Share on other sites More sharing options...
Banga Posted December 23, 2014 Author Share Posted December 23, 2014 was the 1600 it was off running a single sidey too? if it was running twins then the jets will be too small when its supplying 2x the cylinders. if your pump was ok with a downdraft it should be fine with sidey(s), they shouldnt use that much more gas. does it run fine if you ease off a bit? ie the fuel supply fills the bowl up again, or is it dead for while? I would pull the carb off and give it a good clean out and tidy up (and note the jets/tubes etc sizes for later!) before chasing more complicated things. Filter is a good idea but wont be a fix for what currently ails ya Yip running a single, came with a crossflow single side draft manifold. It re-starts pretty easily- seems like it just needs the bowl refilling. I'll pull it apart tonight and give it a good clean. Cheers Quote Link to comment Share on other sites More sharing options...
Banga Posted December 23, 2014 Author Share Posted December 23, 2014 So I've pulled it apart again, I've got a 1.5 needle in there at the moment. I'm guessing it's a no no to simply drill it out to 2mm and chuck it back in? My old 32 dfm had a 2mm needle not really comparing apples with apples though. Quote Link to comment Share on other sites More sharing options...
Banga Posted December 23, 2014 Author Share Posted December 23, 2014 So decided to take a plunge and drilled the needle to 2mm, improved things slightly so bumped it up to 2.5mm which slightly improved things again but it still dies going up a hill. As soon as it died I turned it off and pulled the top off the carb and its definitely an empty bowl causing the problem. Next try moving the fuel pump to just off the tank. 1 Quote Link to comment Share on other sites More sharing options...
Banga Posted December 24, 2014 Author Share Posted December 24, 2014 I now have a car that goes uphill again, moved pump to the fuel tank outlet and away she goes. Cheers guys. Probably need to play with float levels/put the regulator on/go back down to a 2mm needle and seat as its wants to flood now when it coming to a stop. 1 Quote Link to comment Share on other sites More sharing options...
bigmatt4 Posted December 25, 2014 Share Posted December 25, 2014 Remember 2.5 to 3 psi max fuel pressure for weber or delorto need to do that before tuning otherwise you will never get the idle mixtures to stay consistant 1 Quote Link to comment Share on other sites More sharing options...
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