PRJCTMC Posted July 27, 2015 Share Posted July 27, 2015 I want to replace my fuel sending unit. Anyone recommend one that I can drop in and plug and play, without having to bend or mod the sending unit?? I've heard and read a lot of ppl dropping the tank a few times before its right. Wonder if there's one that is ready to go. Quote Link to comment Share on other sites More sharing options...
LostnFound Posted July 27, 2015 Share Posted July 27, 2015 Hi Jeffery....My Spectra Premium sending unit was installed once a few weeks ago and has worked perfectly ever since. The part number for 71/72 cars which is a 2 line sending unit (one of them is a return line) is FG91D. For the 70 Montes, it is a one line sending unit and I don't know the part number. Quote Link to comment Share on other sites More sharing options...
PRJCTMC Posted July 27, 2015 Author Share Posted July 27, 2015 Great! Thanks, I have a 70, so I'll just go looking for a Spectra one. Pretty sure they're the same just no return line. Quote Link to comment Share on other sites More sharing options...
Rock Posted July 27, 2015 Share Posted July 27, 2015 My 70 was a Van Nuys car and had 2 lines. One was a vent Line. If you have the charcoal box under the hood you may have a 2 line unit. Quote Link to comment Share on other sites More sharing options...
PRJCTMC Posted July 27, 2015 Author Share Posted July 27, 2015 Thanks! Mines a Cali one too with it, but it's plugged up. So I'm just gonna take it out. Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted July 27, 2015 Share Posted July 27, 2015 If you have a 2 line pump fine but if you have a 3 line pump (supply,return and to carb) you will need to use that return line or it will create issues Quote Link to comment Share on other sites More sharing options...
Rock Posted July 27, 2015 Share Posted July 27, 2015 If he blocks off the vent Line won't he need a different gas cap? Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted July 27, 2015 Share Posted July 27, 2015 It's not a vent line, it's a return line the vents are on tank, now if all the vent on the tank are capped off then a vented cap is needed Quote Link to comment Share on other sites More sharing options...
Rock Posted July 27, 2015 Share Posted July 27, 2015 This is my tank and sending unit. If I remember correctly the return line went up to some kind of vent box that went to the box under the hood. Wish my car was here so I could look. Quote Link to comment Share on other sites More sharing options...
PRJCTMC Posted July 27, 2015 Author Share Posted July 27, 2015 It has that vent box up top by the gas tank, but I already got me a vent cap, so may just eliminate that. Quote Link to comment Share on other sites More sharing options...
LostnFound Posted July 27, 2015 Share Posted July 27, 2015 Hi All, I'd need to double check but if I remember correctly, here's the hook-up for the 71-72 tanks. The tubes off the sending unit go to the fuel pump....one of them is a push and the other one a pull...or another way of saying it would be....one is a fuel supply line and one is a fuel return line. The three black rubber short hoses off the front of the tank you see in Glen's photo go to the fuel separator assembly. The line from the charcoal canister also goes to the fuel separator assembly. Here's a sketch to show what I am speaking of... TankLineSketch.pdf Quote Link to comment Share on other sites More sharing options...
stangeba Posted July 28, 2015 Share Posted July 28, 2015 My 71 still has all the hoses and canister and lines. I replaced the rubber hoses, some original when I found one hose with a small plastic orifice restricting vapors (I think). Click link for pics: https://picasaweb.google.com/110808817090254771768/20120530?authuser=0&authkey=Gv1sRgCMum-437m4eGBQ&feat=directlink Quote Link to comment Share on other sites More sharing options...
John S Posted July 28, 2015 Share Posted July 28, 2015 I was fortunate enough to find a NOS unit. Paid thru the nose for it but after having three that failed due to floats that sunk and did not float it was worth it. My sending unit has 3/8 fuel line and 1/4 return line. John S Quote Link to comment Share on other sites More sharing options...
PRJCTMC Posted July 28, 2015 Author Share Posted July 28, 2015 It has the canister,but the previous owner Plugged it, when he installed the Edelbrock carb with electric fuel pump. Can I just eliminate everything except the fuel line with out it affecting its performance? Drive train isn't original so kinda defeats the purpose of hooking it all up unless it does affect performance. Quote Link to comment Share on other sites More sharing options...
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