Chambo110 Posted December 17, 2020 Share Posted December 17, 2020 1987 csw. now 200tdi was a td I believe So on the fuel tank can anyone tell me what these bits are for please first pic is near side of car but towards the rear of tank 2nd pic is drivers side , near front of tank Thanks Quote Link to comment Share on other sites More sharing options...
miketomcat Posted December 17, 2020 Share Posted December 17, 2020 First is a fuel line port that is blanked off, must be used on a different engine/model. Second is for a tank breather used if you have a non vented filler cap. Mike Quote Link to comment Share on other sites More sharing options...
Chambo110 Posted December 17, 2020 Author Share Posted December 17, 2020 Ahh ok. so could I use the blanked off fuel line port for a diesel heater?? Quote Link to comment Share on other sites More sharing options...
western Posted December 17, 2020 Share Posted December 17, 2020 1st pic is the sender unit, different from my '89 110, 2nd is a unused breather connection. Quote Link to comment Share on other sites More sharing options...
Chambo110 Posted December 17, 2020 Author Share Posted December 17, 2020 I’m guessing I got amr1495, assuming you have prc8463 then Ralph ? Quote Link to comment Share on other sites More sharing options...
Chambo110 Posted December 17, 2020 Author Share Posted December 17, 2020 So does the return go into the top of tank somewhere Quote Link to comment Share on other sites More sharing options...
simonb Posted December 17, 2020 Share Posted December 17, 2020 (edited) A return normally has a long internal tube to discharge at the bottom of the tank to prevent the return fuel creating foam in the tank. You should be ok to use it as a pick up. Bit of clear hose and a gentle suck will tell you if the bottom end of it is below the fuel surface....If you just get a mouth full of vapour its a vent and not a return. Edited December 17, 2020 by simonb Quote Link to comment Share on other sites More sharing options...
western Posted December 17, 2020 Share Posted December 17, 2020 1 hour ago, Chambo110 said: I’m guessing I got amr1495, assuming you have prc8463 then Ralph ? Yes mine is the PRC8463 https://www.brit-car.co.uk/product.php/89988/5497/fuel_tank_sender_unit_110_defender_up_to_vin_ja915357 it has the 3 elect terminals. for gauge, earth, low fuel level. the return sits top centre of tank, the filler breather is above the main fuel fill connection, have a look at the parts diagram & you'll see the return pipe on top. Quote Link to comment Share on other sites More sharing options...
Chambo110 Posted December 17, 2020 Author Share Posted December 17, 2020 27 minutes ago, western said: Yes mine is the PRC8463 https://www.brit-car.co.uk/product.php/89988/5497/fuel_tank_sender_unit_110_defender_up_to_vin_ja915357 it has the 3 elect terminals. for gauge, earth, low fuel level. So does that mean I don’t have low fuel light? To be honest I never noticed it on dash before. simonb cheers mate very helpful. So, If successful and I do get a mouthful, I could try t into fuel return. But.. the (heater) pump won’t know which direction to suck from, then if I start heater with engine off it could drain the line between (heater) pump and lift pump .. correct or not ?? Thanks Quote Link to comment Share on other sites More sharing options...
simonb Posted December 17, 2020 Share Posted December 17, 2020 It probably a vent, the return usually has a pipe on a plate screwed to the tank. If it is a return, your fuel heater pump will suck from the least resistive path, which is fuel out of the tank, not the lift pump line. My Wabasto is plumbed into the return to the tank, never had any problems, with or without the engine running. The heater draws only a tiny amount of fuel. You could probably tap into the feed into the lift pump if you have no other tank connections, the heater manufacturers don't seem to recommend this though, but can't remember why, it maybe because the heater pump isn't strong enough to compete with the lift pump when the engine is running - the lift pump could in theory suck fuel out of the heater line, but again unlikely given its a much smaller bore than the pick up into the tank. Quote Link to comment Share on other sites More sharing options...
Chambo110 Posted December 17, 2020 Author Share Posted December 17, 2020 Great stuff.. if you do it I’ll try the return feed aswell. Great info. much appreciated Quote Link to comment Share on other sites More sharing options...
miketomcat Posted December 18, 2020 Share Posted December 18, 2020 The spigot on the sender and the top of the tank (pictured) don't have dip pipes so will be no good for eberspacher feed. I have tee'd into the fuel lines and fitted a dip pipe to the tank (eberspacher and webasto sell one) both work well. I forget whether I tee'd into the feed or return both should be sealed and have a dip pipe. If I went this route again I would use a swirl pot on the return as @FridgeFreezer has on his ambulance. A dip pipe on the tank is preferable though as you can set the height above the engine pick up so you always have fuel to start the engine. Mike Quote Link to comment Share on other sites More sharing options...
Chambo110 Posted December 18, 2020 Author Share Posted December 18, 2020 Cheers Mike its not an overnight sleeper, or certainly not at a time of year that would require additional heat. 😂🥶. So I’m not too concerned about running out of fuel. I’ll go for the fuel return as it seems to have worked for simonb and others what’s this swirl pot on return you speak of?? Ta Quote Link to comment Share on other sites More sharing options...
miketomcat Posted December 18, 2020 Share Posted December 18, 2020 Mike Quote Link to comment Share on other sites More sharing options...
western Posted December 18, 2020 Share Posted December 18, 2020 12 hours ago, Chambo110 said: So does that mean I don’t have low fuel light? To be honest I never noticed it on dash before. Possible, a lot of 300tdi vehicles didn't have the low fuel light wired in, but the icon is still on the warning light panel. the PRC8463 is wired --- green/black to sender unit forward spade terminal -- feeds the fuel gauge plain black to ridged stud sender earth white/slate to sender unit rear spade terminal -- feeds low fuel warning light. this looks same as your sender -- https://forums.lr4x4.com/topic/108511-fuel-tank-sender-three-pin-type-wiring/ Quote Link to comment Share on other sites More sharing options...
Chambo110 Posted December 18, 2020 Author Share Posted December 18, 2020 Mike i started reading that a while back.. must of got distracted. Easily done according to my teachers at school. Ralph Yeah I do have a light just never seen it on. This bit has me thinking though “the PRC8463 is wired --- white/slate to sender unit rear spade terminal -- feeds low fuel warning light” In the engine bay on bulkhead in front of driver I found this loose wire the other day. I’m sure it’s white/slate trace?? goes to the big connector in 2nd pic. Quick check looks like it heads off towards rear inside the chassis loom. guess I need to get back under the tank and look for a lonely wire Does the light work by making earth connection same as door pins ?? cheers chaps Quote Link to comment Share on other sites More sharing options...
western Posted December 18, 2020 Share Posted December 18, 2020 When the fuel level is low the light usually starts to flick on off & should stay on when 10litres or less is in the tank, Yes looks like the correct wire, pulled out of its connector block. yes think it earths & completes the circuit. Quote Link to comment Share on other sites More sharing options...
Chambo110 Posted December 18, 2020 Author Share Posted December 18, 2020 28 minutes ago, western said: When the fuel level is low the light usually starts to flick on off & should stay on when 10litres or less is in the tank, Yes looks like the correct wire, pulled out of its connector block. yes think it earths & completes the circuit. Great stuff thanks Assuming then it should be white/slate on other side of connector going to dash light? and if I find that then earthing it should bring on the light yes ? Quote Link to comment Share on other sites More sharing options...
western Posted December 18, 2020 Share Posted December 18, 2020 only if there 10 litres or ;ess in the tank. 1 Quote Link to comment Share on other sites More sharing options...
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