S50B32 Fuel pump problems (e30 m3)

[MrBenn]

I'm having a bit of a problem with my fuel pump. I modified the original intank pump to accept the s50b32 pump and got everything running fine. After a few tests it stopped working and it turned out the small rubber reducer I had used had split down the middle, presumably down to the 5bar pressure. So I replaced this with a much thicker bit of rubber tube and everything seemed fine. Finally got the car Mot'd and on the road, took it for a spin and after about 45 minutes or so of driving the fuel pump disconnected meaning I had to be towed home by the AA (long range tank was full of fuel meaning I'd of had to syphon off about 15-20 litres of fuel just to get the pump out). So after two failures I'm thinking this is not the way to go. Should I replace the original intank pump and fit a 5 bar external?
Cheers,
Alex

[jmc330i]

Should I replace the original intank pump and fit a 5 bar external?

Others have run the B32 pump in the E30 carrier without problems. It may of just been the pumps time??

From memory, some have fitted a Walbro pump into the E30 carrier. Not because its any more reliable, but because its cheaper than a B32 pump.

[HenryM3]

the tubing your using is I presume suitable to be immersed in fuel. My first attempt failed after a short time, got some tubing out of a 5 series tank an its been fine for years.

[RoadHazard]

Should I replace the original intank pump and fit a 5 bar external?

Others have run the B32 pump in the E30 carrier without problems. It may of just been the pumps time??

From memory, some have fitted a Walbro pump into the E30 carrier. Not because its any more reliable, but because its cheaper than a B32 pump.

I replaced my intank fuel pump with the Walbro one. Turned out that I still have to keep the external pump because the Walbro couldn't provide enough juice. Weird.

[UweM3]

As HenryM3 already said you NEED the right tubing material.

I didn't want to get into trouble and have just used the whole intank assembly of an E36 B32.
I needed a swirlpot anyway so I combined the two things.
Fed by the low pressure intank pump

made a swirlpot which accepts the E36 assembly



pressure tested to 2bar


and fitted in the boot with an E36 fuel filter

[MrBenn]

It turned out I had accidentally picked up a peice of servo tubing not fuel line, hence why it only lasted a few days, its since been swapped for fuel line and has been fine so far but I am aware it probably wont last and as has been said above you need proper "in tank" fuel line. Thanks for the tip of where to find some cheap Harry

[HenryM3]

UweM3 you flash sod

[UweM3]

UweM3 you flash sod

only hitting 2 birds with one stone. Form follows function is my motto.