80datson Posted October 2, 2011 Report Share Posted October 2, 2011 having trouble deciding where to mount my fuel pump. i know i need to mount it as close to the fuel tank as possible but where exactly? also i just hook up the rubber hose coming from the fuel tank to the fp and then the other end to the metal fuel line that goes to the engine bay? Quote Link to comment
datzenmike Posted October 2, 2011 Report Share Posted October 2, 2011 Good thing I checked.. this is for a KA motor in a 310 right??? This should be in your profile so a fuel pump for an A series isn't discussed. Yours will be a high pressure pump for the EFI. The metal line isn't designed for this but I wouldn't have any problem using it. Make sure the clamps ahead of the pump are adequate for the garden hose pressure. The tanks in the 310 are high above the rear end which is good as the pump should also be mounted as low as possible to take advantage of gravity feed from the tank. Fuel pumps are great at pushing but suck at sucking. No pump made, no matter how powerful, can draw fuel vertically over about 30 feet so vertical lift is to be avoided. Other than that, mount outside the car for cooling and to lessen the sound and place where road debris wont's damage it and it won't scrape on anything. Quote Link to comment
80datson Posted October 3, 2011 Author Report Share Posted October 3, 2011 Yea sorry about that i will add that to my profile.. OK I will keep that in mind.. asking there isn't a intank fuel pump I have to worth about right since the a series used a mechanical pump? Quote Link to comment
datzenmike Posted October 3, 2011 Report Share Posted October 3, 2011 I assumed you would get a external high pressure in line pump for this. The stock pump is about 14 times to low a pressure to work the EFI injectors. Quote Link to comment
albyneau Posted October 3, 2011 Report Share Posted October 3, 2011 Good thing I checked.. this is for a KA motor in a 310 right??? This should be in your profile so a fuel pump for an A series isn't discussed. Yours will be a high pressure pump for the EFI. The metal line isn't designed for this but I wouldn't have any problem using it. Make sure the clamps ahead of the pump are adequate for the garden hose pressure. The tanks in the 310 are high above the rear end which is good as the pump should also be mounted as low as possible to take advantage of gravity feed from the tank. Fuel pumps are great at pushing but suck at sucking. No pump made, no matter how powerful, can draw fuel vertically over about 30 feet so vertical lift is to be avoided. Other than that, mount outside the car for cooling and to lessen the sound and place where road debris wont's damage it and it won't scrape on anything. Not too familiar with the 310's, or KA's for that matter, but regarding pumps in general~ Mechanical diaphram pumps are indeed designed, and operate well, sucking fuel, as they have backflow valves (usually spring/puck, or possibly reed) in them making every stroke positive flow. Electromechanical pumps are typically vane or gyrotor design- having designed clearances between moving parts for lubrication/friction/heat expansion/etc.. This clearance does not create a 100% positive flow, and allows a bit of bypass to occur- making them location-sensitive. Optimum e/m pump (not the electric motor- but the pump guts themselves)mounting shoud be at or slightly below the bottom of your fuel supply. This takes maximum advantage of Mother Nature's capillary action, and reduces the possibility of losing pump prime after sitting for any length of time. Fuel pressures in general terms are: mechanical pumps- up to about 9psi TBI setups- 12-20psi Portfuel setups- 20+ up to 45-50 (depending on system, mods, etc.) In addition to PSI one must consider fuel flow in GPM as well. If your 310 had a smaller motor it's very likely the 1/4" fuel line will restrict flow for the larger KA~ resulting in reduced performance under load and/or at higher rpm's. This reduced flow can cause the injectors to fall into 100% duty cycle while trying to keep up with the O2 signal~ wearing on them over time. Of course if you're carb'ed then it'll just fall flat on it's face, people will pass you by, point, and laugh..... Let's not let that happen~ the whole point of a motor swap, right? P.S.~ if your KA's injected (or gonna be) leave the old line in place for a return line.... Peace~ Scott Quote Link to comment
80datson Posted October 3, 2011 Author Report Share Posted October 3, 2011 I assumed you would get a external high pressure in line pump for this. The stock pump is about 14 times to low a pressure to work the EFI injectors. Yes I got one from summit racimg i got it like 3 months ago.. here's a pic.. Quote Link to comment
80datson Posted October 3, 2011 Author Report Share Posted October 3, 2011 Would this filter be too big? Quote Link to comment
Trophy24 Posted October 14, 2011 Report Share Posted October 14, 2011 That depends on where you plan to mount it. Looks like a filter for a carburetor application. If it is you may not want to mount that on the pressure side of that pump. Quote Link to comment
80datson Posted October 14, 2011 Author Report Share Posted October 14, 2011 I thought that too.. but this is going inbeteeen the pump and gas tank Quote Link to comment
datzenmike Posted October 14, 2011 Report Share Posted October 14, 2011 Avoid any restriction between tank and pump. That filter will never survive 40 PSI do not use ahead of the pump. Get the stainless steel ones. Quote Link to comment
80datson Posted October 14, 2011 Author Report Share Posted October 14, 2011 So a stainless Stella one before the fuel pump to protect thefuel pumpand I'm using the stock filter to the ka before the fuel rail Quote Link to comment
datzenmike Posted October 14, 2011 Report Share Posted October 14, 2011 You don't need the stainless filter on the tank side. The fuel filter shown will work fine if only drawing fuel through it. It won't handle the pressure side. Does the pump have it's own filter built in? Like the 720 pumps. Quote Link to comment
80datson Posted October 14, 2011 Author Report Share Posted October 14, 2011 I doubt it Quote Link to comment
drastic520 Posted October 24, 2011 Report Share Posted October 24, 2011 glad I found this. I finished my k swap only 521 and I'm having n issue with this. looks like the pump I not too good at pulling the fuel from the tank. wonder if I use a fitting on the bottom of the tank to feed the pump will help? that way it won't have to pull from the top. sorry I jacked ur thread man. Quote Link to comment
80datson Posted October 24, 2011 Author Report Share Posted October 24, 2011 glad I found this. I finished my k swap only 521 and I'm having n issue with this. looks like the pump I not too good at pulling the fuel from the tank. wonder if I use a fitting on the bottom of the tank to feed the pump will help? that way it won't have to pull from the top. sorry I jacked ur thread man. No worries yes use gravity to feed yer pump that's what I did I mounted it as close and low to the tank for best performance Quote Link to comment
datzenmike Posted October 25, 2011 Report Share Posted October 25, 2011 That bolt in the bottom is for draining. I wouldn't use it for a feed as it's to easy to hit something on the road and rip it off. The tank line is fine and although it has to rise vertically up and out, it also drops down on the outside and this cancels it out. Mount the pump lower than the tank or as low as you can safely. Pumps can push, no problem, but they suck at sucking. 1 Quote Link to comment
drastic520 Posted October 25, 2011 Report Share Posted October 25, 2011 Pumps can push, no problem, but they suck at sucking. You said it!!!!! Quote Link to comment
Zfighter76 Posted October 25, 2011 Report Share Posted October 25, 2011 Avoid any restriction between tank and pump. That filter will never survive 40 PSI do not use ahead of the pump. Get the stainless steel ones. i use the filter for the fuel injected 280z on my z series engine and my pump works well at drawing through the filter and its a 44$ mr. gasket pump for 4-7 lbs. no problems yet. but i can imagine how it would be better not to restrict flow. back to the point, the stainless filters are really nice. i would recommend using the one found on stock 280z's. it seems high quality Quote Link to comment
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