611 Posted November 16, 2012 Share Posted November 16, 2012 Im just after a bit of technical help on fuel tanks. Im running full injection with throttle bodies on my A series. Im using the A series tank and have an in-tank pump fitted that has the send and the return on it, but what i want to know is do i need any sort of pressure relief valve on the tank or vent? Is it possible that the tank could get pressurized or the opposite and be sucked in? and what should i do with the two vents on the top side of the tank as normally these just loop up to the filler neck. Any info would be great. Thanks Andy Quote Link to comment Share on other sites More sharing options...
OPEL PARTS GREECE Posted November 18, 2012 Share Posted November 18, 2012 What pump you have used? Why in tank pump? Exterior pumps with all the extras do a great job Your must have a presure relief valve according to the engine fuel pressure data......or else the injectors...... Also in the specific tank you must have also a fuel flow valve Quote Link to comment Share on other sites More sharing options...
611 Posted November 18, 2012 Author Share Posted November 18, 2012 It's a high pressure one from a fiat punto GT, as I didn't want to have the old setup of low pressure into swirl pot and then high pressure. So this is a complete unit with swirl pot filter etc... There are some pictures on my blog www.theopelproject.com I think I might need a pressure relief valve fitted some where in the tank, but don't know much about injection systems. Andy Quote Link to comment Share on other sites More sharing options...
tony g Posted November 18, 2012 Share Posted November 18, 2012 Andy as long as the tank vents to the filler neck you'll be fine mate. The return from tb's simply drops unused fuel back around the pickup area for reuse. Tony Quote Link to comment Share on other sites More sharing options...
mantadoc Posted November 18, 2012 Share Posted November 18, 2012 To answer the breather question, I don't have an A series but on both the Opel Kadett C and Manta Coupes, from memory the little breather pipes join into 1 and then exit under the car so there is a way to let air into the tank to stop it developing a vacuum.. From memory also hatch has more of the little breather pipes welded in due to it's weid shape and they all join together and go up to a valve near the filler neck but years since I had a hatch. If required I'll confirm with pics next week Quote Link to comment Share on other sites More sharing options...
611 Posted November 18, 2012 Author Share Posted November 18, 2012 Hey Tony and mantadoc, thanks for the info, i thought that might be the case but didn't want to find out it pressurised the tank when i do finally get it all up and running :-) Tony, as you can tell, i still haven't got the car anywhere near running yet! been having problems getting some Goodridge fittings for the fuel line and also decided to get the front cover powder coated and thought i had a spare seal for the front crank, but it turned out to be an axel one :-( so after buggering up the good one that i put in before the cunning plan to get it coated, im now waiting for a new one! Once i have these i might be able to get all the engine back together and wont be far off turning it over :-) I also decided to pull the 5 speed apart to check it was ok, so have that to build back up. How's things with you?? Andy Quote Link to comment Share on other sites More sharing options...
tony g Posted November 19, 2012 Share Posted November 19, 2012 Theres always one more thing lol. im good mate making some progress on the race car and lots of plans for the road car tony Quote Link to comment Share on other sites More sharing options...
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