IrvinM Posted July 18, 2013 Report Share Posted July 18, 2013 Hello, I am new to the forums. I just picked up (on 7/12/13) a 1975 Datsun 620 pick up and been trying to fix it since (less than a week). I will be visiting this forum often. So my problem right now is that I just discovered that my truck does not have a fuel filter! this is bad. I decided to park it (2 days now) and wait until I buy the filter (im on my way). The only thing is that I have been looking on the internet and discovered a couple of threads talking about a pre filter for the fuel system. I want to know more about it. Which one to buy, and where to install it. One guy said he bought the Fram G3 fuel filter and installed it before the tank. I am not very familiar with fuel systems but I can't imagine where this "before fuel tank" place is at. Can I just put it right next to the fuel filter? or does it have to be close to the fuel tank? I don't know. Any help is appreciated! :-) Pictures would be GREAT! Quote Link to comment
Eagle_Adam Posted July 18, 2013 Report Share Posted July 18, 2013 im assuming you 620 has an L motor? Quote Link to comment
Eagle_Adam Posted July 18, 2013 Report Share Posted July 18, 2013 this is what you will need, no pre filter needed. Not that it would hurt but its not needed http://compare.ebay.com/like/281129590034?var=lv<yp=AllFixedPriceItemTypes&var=sbar Quote Link to comment
Eagle_Adam Posted July 18, 2013 Report Share Posted July 18, 2013 i buy em for a couple bux at my local parts store, auto zone normally has em on the shelf Quote Link to comment
datzenmike Posted July 18, 2013 Report Share Posted July 18, 2013 If you get them for a couple of bucks change them every year. The last two I took off had the filter element rattling around inside. They are very cheaply made these days so get a good one or change often. Quote Link to comment
datzenmike Posted July 18, 2013 Report Share Posted July 18, 2013 Never heard of a pre filter, probably needed on delicate EFI systems that would plug up the injectors. Carbs are too big and (really) small particles pass right through. 2 Quote Link to comment
KlassicMotion Posted July 19, 2013 Report Share Posted July 19, 2013 this is what you will need, no pre filter needed. Not that it would hurt but its not needed http://compare.ebay.com/like/281129590034?var=lv<yp=AllFixedPriceItemTypes&var=sbar That filter is nice, because you can see inside it. You can see when it's dirty and if the element falls off. It's also the stock style so it will fit in the stock location. I'm running one on my 510. Mike is right, one filter that is changed regularly is enough for a Carb. This one is nice for the reason you can see inside, but it's also reusable. You can unscrew it and change the filter. If you wanted to run a second filter, you could put this one back by the fuel tank. Two filters isn't necessary, but ideally, you should have the filter closer to the fuel tank. This way, if you have rust or debri in the tank, it will get caught in the filter before it has the chance to clog your fuel lines... The factory wasn't worried about this, but that's when the truck was new. Now it's had 30+ years to aquire rust. I have a '76 Bronco that had the problem of the mechanical fuel tank selector switch (dual tanks) getting clogged. I put filters on both lines between the tank and the selector switch.... No more problems. http://www.summitracing.com/parts/mrg-9747/overview/ Quote Link to comment
PDX Matt Posted July 19, 2013 Report Share Posted July 19, 2013 I just picked up a Wix filter and going to be installing it soon. Their filters are high quality and very cheap to buy from Rock Auto (rockauto.com). I recommend picking up any other parts you need as well to save on shipping. Quote Link to comment
MikeRL411 Posted July 19, 2013 Report Share Posted July 19, 2013 If you get them for a couple of bucks change them every year. The last two I took off had the filter element rattling around inside. They are very cheaply made these days so get a good one or change often. Oh for the good old days of the glass bowl filter housing with "rag bag" [looks like silk but that would dissolve in gasoline] filter element. You periodically removed the rag bag and reverse flushed it. the only possible wear out element is the gasket on the bowl to top hat fixture and the secondary gasket on the filter element to housing inlet to filter junction. Mine is 45 years old and works like a charm! 1 Quote Link to comment
IrvinM Posted July 19, 2013 Author Report Share Posted July 19, 2013 im assuming you 620 has an L motor? Yes sir! its the L20B. Sorry for the late response. My car is fixed by the way... I managed to brake the breather hose and thought the piece of metal on the valve cover was a PCV valve. I learn the hard way... I'll fix it tomorrow, I think the 620 is drive-able. Quote Link to comment
Dawa Posted July 19, 2013 Report Share Posted July 19, 2013 That filter is nice, because you can see inside it. You can see when it's dirty and if the element falls off. It's also the stock style so it will fit in the stock location. I'm running one on my 510. Mike is right, one filter that is changed regularly is enough for a Carb. This one is nice for the reason you can see inside, but it's also reusable. You can unscrew it and change the filter. If you wanted to run a second filter, you could put this one back by the fuel tank. Two filters isn't necessary, but ideally, you should have the filter closer to the fuel tank. This way, if you have rust or debri in the tank, it will get caught in the filter before it has the chance to clog your fuel lines... The factory wasn't worried about this, but that's when the truck was new. Now it's had 30+ years to aquire rust. I have a '76 Bronco that had the problem of the mechanical fuel tank selector switch (dual tanks) getting clogged. I put filters on both lines between the tank and the selector switch.... No more problems. http://www.summitracing.com/parts/mrg-9747/overview/ when i had a lot of rust in my tank (before i cleaned it) i ran 2 filters. i used the filter klassic mentioned as a pre filter and i ran the stock style filter after it. that mr gasket filter is much finer, yet not restrictive. it catches a lot more rust than my stock filter would. NOW im just running the mr gasket style filter. with the mr gasket filters, you dont actually have to change that filter inside there. you CAN but you dont have to. its reusable, i just hit mine up with carb cleaner. they are known to have defects/problems. nothing big deal... sometimes the gaskets in them fail. mine has been failing for the last year. perhaps because i overtorqued the end caps (there is not torque called out.) i tightened it pretty tight because obviously i didnt want any fuel to leak by. even with one of my gaskets kinda messed up, its still not leaking. eventually i will get one of the older style glass bowl types. Quote Link to comment
elmerfudpucker Posted July 19, 2013 Report Share Posted July 19, 2013 I replaced my wix filter on the trip over from WA after some bad gas once over the pass. I keep a spare now just in case. Wix is the shiznit! Quote Link to comment
Z-train Posted July 19, 2013 Report Share Posted July 19, 2013 I replaced my wix filter on the trip over from WA after some bad gas once over the pass. I keep a spare now just in case. Wix is the shiznit!yuuuuup! Quote Link to comment
Trophy24 Posted July 19, 2013 Report Share Posted July 19, 2013 Had a bad experience with the glass filter leaking. Fuel leak under hood = bad Quote Link to comment
Z-train Posted July 19, 2013 Report Share Posted July 19, 2013 Had a bad experience with the glass filter leaking. Fuel leak under hood = badyes,indeed. Quote Link to comment
KlassicMotion Posted July 19, 2013 Report Share Posted July 19, 2013 I've only had problems with the Mr Gasket filter when I over-tightened it.... Quote Link to comment
Dawa Posted July 20, 2013 Report Share Posted July 20, 2013 Had a bad experience with the glass filter leaking. Fuel leak under hood = bad completely agree. however, its not as dangerous since the exhaust mani is on the other side of the engine. but no leaks are better than some. I've only had problems with the Mr Gasket filter when I over-tightened it.... yeah. i wish everything had a torque spec, so i would stop over-tightening shit Quote Link to comment
Trophy24 Posted July 30, 2013 Report Share Posted July 30, 2013 My leak was totally my fault for over tightening. Still scared the crap out of me. Quote Link to comment
igotatruck Posted June 20, 2017 Report Share Posted June 20, 2017 Just replaced the fuel filter in my 720 KC. It made a world of difference for the $5 and 10min I put into it. The old filter was so clogged I thought my clutch was still slipping. Better accel, engine runs much smoother. Quote Link to comment
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