Fuel Lines? - BMW Forum

mrfc3s · 05-20-2006, 11:52 AM

Hey, has anyone replaced Fuel lines? if so, what sizes do i need? how long? and ive got a leak at/near the filler neck, how do i get to it... Ive got a 325i with motronic

mrfc3s · 05-20-2006, 02:49 PM

oh, another question, ive aparently got a Motronic 1.0 Car(before 03/87) so i have i think an External Main Pump and then a transfer secondary pump in the gas tank, correct? well, is there much difference between it and the later internal pump Assy? Also, is it normal to hear a loud whirrring from around the Tank area? i assumed it was the pump, but to my knoledge ive never heard any fuel Pumps whine like that... alll loud and crap.

also, where exactly is the Fuel Filter? i saw somthing that looked like it, but im not sure, it was under the Drivers rear door... accompanied by a small Diaphram looking thing... what is that?

ARGGGG.... i kinda hate older cars somtimes... looks like im in for replacing the ENTIRE Fuel System... Ive got leaks everywhere and i dont feel like hunting them down... I was thinking about Cleaning, Inspecting and replacing the Fuel Tank and replacing the pumps...(would i be able to use like two Aftermarket Walbro Pumps or somthing like it?) and replacing ALL of the hoses in the rear of the car... what do you guys think?

draculia · 05-24-2006, 11:18 AM

if you replace the intank pump with a walbro, then you cant ditch the pump up front.

the fuel lines are 8mm which is essentially the same as 5/16.

the filter is where you thought it was. you can ditch the diaphram thing also, later cars don't use them. it is supposed to dampen pulses in the fuel system.

mrfc3s · 05-24-2006, 02:00 PM

hehe, thats what i thought, so the internal Pump could be made into a Single Pump and that was the filter, AND that was the Pulsation Dampener(I have an RX7, we know about these as they are a VERY DANGEOUS FIRE HAZARD TO OUR CARS) ok, is it possiable that the Parts store then gave me the wrong Fuel Filter? the one I have is Larger than the one on the car now, looks like it would work though. Thanks for the info

mrfc3s · 05-29-2006, 05:49 PM

Question, Has anyone taken the Tank off of one of these bad boys? Where are all the bolts? and did you have to take the drive shaft out? also what the hell is that metal line that goes over the Driveshaft tunnel? looks like it connectes the protruding "Tanks"
need somthing back asap
thanks
Tim

Starmavin · 05-29-2006, 09:19 PM

The fuel tank goes across the width of the car, that line alows fuel to even out both sides. To remove it you must take out the exhaust and drive shaft. But why do you want to do this? This isn't the normal POS vehical design where you must remove the tank to get to the pump, this design to me sounds like a case of cranial rectalitis! Just pull the back bench seat and remove 4 screws on the oval access plate on the passenger side. Then take out the fuel tank sending unit with the 4 nuts (don't forget the washers) then remove the pump. Easy.

The fuel filter is under the brake master cyl.

mrfc3s · 05-30-2006, 12:25 AM

hehe, guess i should have said why... i knew about the fuel pump "door", its the same way in my 7

theres aparently a leak somewhere on the top of the tank... i cant see it but i checked the Main line to the and dont see a culprit... rather than mess around anymore, figured id go in for a better looksee. Im planing to have to replace it anyway so its not a big deal, Just getting it down is... lol bolts are rusted to S*** and i didnt see any straps holding that tank in there...
so if i have to remove the Driveshaft and exaust, WHY DIDNT HAYNESS MANUAL TELL ME.... so fustrating... Guess its not that big a deal, i was planning on replacing the Guibo and the carrier berring anyway, just not now..

Rust Sucks... :P