Kosij Donating Members 2,045 Member For: 13y 3m 16d Gender: Male Posted 29/07/14 04:26 AM Share Posted 29/07/14 04:26 AM Walbro 460 flows a fair bit more then a Bosch pump Kosij. And I run an -6 line back to my surge and and standard return to tank and can get down to 2 bar minimum. Twin 044's as wellI have a walbro intank pump feeding the surge then twin 044's to the rail and then a fpr1200 with a -6 return to surge and stock lines back to fuel tank my base pressure can go under 40psi! Link to comment Share on other sites More sharing options...
gaz097 Bronze Donating Members 1,751 Member For: 13y 4m 5d Posted 29/07/14 05:26 AM Share Posted 29/07/14 05:26 AM Again you have missed the point of twin walbro pumps flowing more then twin 044's Kosij. Looking at the process west fitting kit they supply it seems like it is the return line to the tank being to small. As you have almost 3 walbro 460 pumps trying to go down a 8mm return hose. Are the pumps on separate relays? Link to comment Share on other sites More sharing options...
45T-XR Donating Members 417 Member For: 17y 8m 20d Gender: Male Location: Gladstone, Queensland Posted 29/07/14 05:56 AM Share Posted 29/07/14 05:56 AM ^My thoughts exactly. I wasn't 100% sure on exactly flow data but was confident the twin walbro's flow more fuel than the 044's, but it doesn't matter. We need to start going through the process to get it sorted.Check the base fuel pressure with the vac line off firstly and we can go from there. Link to comment Share on other sites More sharing options...
gaz097 Bronze Donating Members 1,751 Member For: 13y 4m 5d Posted 29/07/14 08:13 AM Share Posted 29/07/14 08:13 AM Vacuum will cause a lower pressure when connected to the reg any way. I'd be looking at the your swirl pot and trying to remove any restrictions there Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 5m 30d Gender: Male Location: @ my laptop Posted 29/07/14 10:27 AM Share Posted 29/07/14 10:27 AM this is the beauty of my fuel flow module on the dyno, allows us to check what is actually flowing what and what pressures 3 Link to comment Share on other sites More sharing options...
IH8TOADS Silver Donating Members 3,618 Member For: 19y 4m 19d Gender: Male Location: OZ Posted 29/07/14 10:50 AM Share Posted 29/07/14 10:50 AM Run the return direct off the reg into a bucket and block the return to the surge. Re-test pressure. 2 Link to comment Share on other sites More sharing options...
turbotrana Member 2,586 Member For: 21y 7m 27d Gender: Male Posted 29/07/14 11:53 AM Share Posted 29/07/14 11:53 AM (edited) You need to check each section to see where the restriction lies.If you measure the ID of the of the plastic connector for the return on the fuel pump cradle you will find it only measures around 4mm. So your return line is meant to be 5/16 (about 8mm) then hits entrance to the fuel pump cradle and there you have a restriction.The one way valve in the FPcradle is a restriction so take that out (yes I know about the start up issue thingo). Then you have the venturi that you got to drill out.But in saying that, when you remove the oneway valve, the orifice is only 4mm without further drilling and you can drill the venturi 4+ mm and it will still work with a high flowing return.So my first step would be to do what Toads said and then work down the line. The next point would be disconnect the return at the fuel pump cradle and set up a connection so it flows out of the car.Maybe you can drill out the plastic inlet on the cradle a little, the one way valve out to 5mm and the venturi to 5mm Edited 29/07/14 11:55 AM by turbotrana 1 Link to comment Share on other sites More sharing options...
Kosij Donating Members 2,045 Member For: 13y 3m 16d Gender: Male Posted 29/07/14 12:49 PM Share Posted 29/07/14 12:49 PM I bet the return from reg to surge is the issue like I/we said many times ago. Link to comment Share on other sites More sharing options...
willo88 Member 700 Member For: 12y 10m 1d Gender: Male Location: Newcastle Posted 29/07/14 08:54 PM Share Posted 29/07/14 08:54 PM I reckon it's the fuel rail and return line to the surge Link to comment Share on other sites More sharing options...
collierj Member 56 Member For: 11y 6m 19d Gender: Male Posted 29/07/14 09:44 PM Author Share Posted 29/07/14 09:44 PM we are pretty sure its the return line. but AFR seems to be perfect. so dont think we are really going to worry about it. Cheers for all the help Link to comment Share on other sites More sharing options...
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