Regulator next to feul pump

Fri Jul 31, 2009 9:54 pm

Was changing the pipes at the feul pump under the car and noticed something that looks like a regulator, is this necessary or can i remove it, what does it do?

Fri Jul 31, 2009 10:18 pm

guess you mean the fuel pulse damper. I have removed mine because I run the whole E36 fuel system with matching pump and filter

Fri Jul 31, 2009 10:24 pm

UweM3 wrote:guess you mean the fuel pulse damper. I have removed mine because I run the whole E36 fuel system with matching pump and filter

Thanks UweM3, i've been following your build, excellent stuff....

what eaxctly does the fuel pulse damper do? im running stock fuelling with my s50, can i remove this part?

Sat Aug 01, 2009 12:36 pm

remove it dude

not required on the S50 and should flow a little better with it removed.

should only be fitted to cars with an external fuel pump BTW guys .

Sat Aug 01, 2009 5:14 pm

Ant wrote: should only be fitted to cars with an external fuel pump BTW guys .

care to explain? I can't see the difference between a internal or external pump.

As far as I understood it, the fuel pressure damper is to provide a little buffer for situations when one suddenly lifts off full throttle to dampen a sudden raise in line pressure till the FPR has caught up and realeased the fuel pressure.
Imagine all injectors firing on full flow, the pump on full tilt to keep the pressure up and you lift off in a sudden.

There is a long debate about the removal of the damper or not on S14.net and so far nobody seems to have an ill effect by removing it. I kept mine (while the S14 was fitted) because having it didn't cause any trouble either.

Sat Aug 01, 2009 6:32 pm

Whilst on the subject, if I fit an accumulator am I likely to get less fuel starvation on hard right handers?

Sat Aug 01, 2009 8:28 pm

DanThe wrote:Whilst on the subject, if I fit an accumulator am I likely to get less fuel starvation on hard right handers?

what do you mean by accumulator? The presence of the fuel damper does bugger all for fuel starvation. Only way to 100% stopping it is fitting a swirl pot.

Sat Aug 01, 2009 9:09 pm

Its possibly the same as a damper, just ive never heard it called that before. For some reason realoem lists it as a strainer

http://www.realoem.com/bmw/showparts.do ... g=13&fg=10

Basically a plate on a spring inside a cylinder...

With the M50 I never had starvation, but when I went to M52B28 I got stuck with it, it wasnt so bad with the standard engine but now im on the modified engine with more power its happening more often

Sat Aug 01, 2009 9:22 pm

what power is your e30 dan? my standard e30 pump struggled to fuel mine at stage 1 power levels(270bhp) and you could feel it holding back at higher revs. a direct replacement escort cosworth walbro 255 pump cured it for about £100.

Sat Aug 01, 2009 9:28 pm

In the sig fuzzy, ive got an uprated 255 LPH pump fitted, the only time I have grief from it is when turning hard right, ie roundabouts with 1/3 tank or less

Sat Aug 01, 2009 9:34 pm

so it is. i missed that bit. sounds like your best bet is the previously mentioned swirl pot. i had a low pressure in tank pump feeding the swirl pot then a high pressure external pump feeding the engine from the pot that was fitted in the boot at the rear. that was in a different car though. ive never had any problems with my e30 after fitting the walbro.

Sat Aug 01, 2009 10:40 pm

What I dont want is a big lump in the boot, ive thought about fitting a second pump/sender in the sender hole in the left side of the tank, possibly feeding the fuel pot on the right side, but this has more chance of running dry