markssupra Posted April 1, 2014 Share Posted April 1, 2014 Hi all I am currently sorting the duel pumps on my build but would like to check a few things. I have found this wiring diagram on a few places now and seems to be the way to go although there are also a few opinions on using 2 fuses and relays if one fuse was to blow under full load and cause fuel starvation, bye bye engine I will be using a syvecs and I am thinking that if one pump stopped working the syvecs would sense a fuel pressure drop and go into limp mode before destroying the engine. If I were to wire the duel pumps through a single fuse and relay obviously I would lose engine power completely. Looking at a few sites for the current draw on a GSS341 I found the pumps draw a maximum of around 17 amps at 130 psi, what pressure will I be running at with 1000cc injectors If I did wire through a single relay/fuse. Quote Link to comment Share on other sites More sharing options...
Lee P Posted April 1, 2014 Share Posted April 1, 2014 That's basically it but you would take the fuel pump ecu out and let the syvecs control both pumps Give me a shout if you want me to talk you through it Quote Link to comment Share on other sites More sharing options...
markssupra Posted April 1, 2014 Author Share Posted April 1, 2014 Thanks Lee, When's a good time to call Quote Link to comment Share on other sites More sharing options...
mattdavies Posted April 1, 2014 Share Posted April 1, 2014 On a side note - If not running a syvecs or another ECU that monitors Fuel pressure. Would it not be better to run it on ONE fuse (or one signal of some description ) so that is one goes they both turn off, you loose power and cant run as opposed to one switching off and running lead ? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 1, 2014 Share Posted April 1, 2014 Without monitoring pressure or current draw how will anything know one pump has failed? What ecu are you running then? Quote Link to comment Share on other sites More sharing options...
markssupra Posted April 2, 2014 Author Share Posted April 2, 2014 Syvecs Chris Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 2, 2014 Share Posted April 2, 2014 In that case just map it to go into a safe mode if it goes lean under boost, overheats or sees low oil pressure etcetera. KISS Quote Link to comment Share on other sites More sharing options...
Lee P Posted April 2, 2014 Share Posted April 2, 2014 Syvecs can trip if fuel pressure drops but it also has a lean lambda trip This is triggered if the AFR drops below a certain point when the car is on boost Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 2, 2014 Share Posted April 2, 2014 The advantage of going safe mode on lean is it covers many scenarios in one hit, of course. Knock, Lambda, engine temp and oil pressure monitoring should cover most bases. It can also allow you consider the option of not making the interior look like an accessory shop display, with dozens of gauges, should you have a mind to. Quote Link to comment Share on other sites More sharing options...
markssupra Posted April 2, 2014 Author Share Posted April 2, 2014 Syvecs can trip if fuel pressure drops but it also has a lean lambda trip This is triggered if the AFR drops below a certain point when the car is on boost Thanks Lee, I have started reading what the syvecs is capable of and its very impressive. I'll be making a start on the pump wiring later and running the fuel hoses. I have been trying to find a definitive answer about what to do when removing the charcoal canister, and a possible build up of pressure in the fuel tank if the vent pipe is blocked off. All the original fuel lines have been removed so would it be best to just block off the vent pipe on the top of the tank? The advantage of going safe mode on lean is it covers many scenarios in one hit, of course. Knock, Lambda, engine temp and oil pressure monitoring should cover most bases. It can also allow you consider the option of not making the interior look like an accessory shop display, with dozens of gauges, should you have a mind to. Thanks for the info Chris, one of the many reasons for choosing the syvecs was there being no need for gauges. Looking forward to learning much more as my build progresses Quote Link to comment Share on other sites More sharing options...
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