Fuel pressure issues

[ste]

Thanks Dameon, excellent feedback, will get one ordered.

I'm having exactly the same problems Dameon, definite hesitation at WOT, and especially if applying WOT after a long corner, i.e. off a roundabout or similar. All these symptons are also amplified if the tank is below 2/3rds.

I have this problem with mine after a roundabout or very long (taken fast) right hand bend.I am assuming that the evo pump i am using is functioning correctly,but getting fuel starvation as all the fuel goes to the passenger side of the tank.Not a problem with the standard e30 engine as it doesn't consume as much fuel.The solution i think is to fit a swirl pot.
Small pump feeds that ( standard e30 one would be fine) then a high pressure pump goes from the swirl pot to the engine.

what do you think ?

I've thought the same. I don't really want to fit a swirl pot though. Not sure where I'd 'hide' one in a tourer either.

Weird thing is I didn't have this problem until I changed my fuel tank. My original tank had the usual rotten filler neck so I replaced it but used a Euro Crap Part tank. Maybe it's not as well 'baffled' inernally? Do you have an Original BMW tank?

I foam filled the tank on my race car to prevent fuel surge. I may well just try foam filling this E30 tank and see if that cures it. (Afer fitting one of these 255lph pumps).

[old_skool]

Just got back from the dyno runs earlier today. The car produced 283.5Bhp which I am perfectly satisfied with Figure at the wheels was 239.1Bhp. I'll scan the graph later and post it up on my build thread.

[d6dph]

Congrats mate. Good figure.

[maxfield]

Shit off a shovel

[ste]

Good work.

[e30_Turbo]

Excellent result

[hass]

hi people i bought a fuel pump too for my turbo project
but then realised that i have a external

but ive been told that i have a pump in the tank that feeds the main pump (n/s/r underside)
can i use this performance pump or does it have to go back up for sale

[beardymat]

i cant answer your question hass but if it turns out you dont need it ill give you what you paid for it since i was going to order one anyhow

[buster]

Thanks Dameon, excellent feedback, will get one ordered.

I'm having exactly the same problems Dameon, definite hesitation at WOT, and especially if applying WOT after a long corner, i.e. off a roundabout or similar. All these symptons are also amplified if the tank is below 2/3rds.

I have this problem with mine after a roundabout or very long (taken fast) right hand bend.I am assuming that the evo pump i am using is functioning correctly,but getting fuel starvation as all the fuel goes to the passenger side of the tank.Not a problem with the standard e30 engine as it doesn't consume as much fuel.The solution i think is to fit a swirl pot.
Small pump feeds that ( standard e30 one would be fine) then a high pressure pump goes from the swirl pot to the engine.

what do you think ?

I've thought the same. I don't really want to fit a swirl pot though. Not sure where I'd 'hide' one in a tourer either.

Weird thing is I didn't have this problem until I changed my fuel tank. My original tank had the usual rotten filler neck so I replaced it but used a Euro Crap Part tank. Maybe it's not as well 'baffled' inernally? Do you have an Original BMW tank?

I foam filled the tank on my race car to prevent fuel surge. I may well just try foam filling this E30 tank and see if that cures it. (Afer fitting one of these 255lph pumps).

Hi ste,
I've got a crap ecp fuel tank also.I wonder if thats the problem then.I don't really want a swirl pot either.

[ste]

I bet that's our problem than mate...

Ian332isport also has a non-gen tank, he hasn't reported any issues AFAIK. Will check with him.

I'll foam-fill mine and see if it helps and report back.

[buster]

I bet that's our problem than mate...

Ian332isport also has a non-gen tank, he hasn't reported any issues AFAIK. Will check with him.

I'll foam-fill mine and see if it helps and report back.

Ian with a non genuine part ? i dont believe it !
Or maybe he just drives to slow

[ste]

Ian with a non genuine part ? i dont believe it !
Or maybe he just drives to slow

I don't believe that either!

[DanThe]

I have an ECP tank and ive never had a problem with it on corners or anywhere, I run it until its almost dry regulary

Just bought one of those eBay pumps, rude not to at that price!

[DanThe]

Thought id wake this thread up again

Here is a pic of the eBay pump fitted to the bracket



It wouldnt go through the hole in the tank with the jubilee though, I didnt have any crimp tie things the right size so just used some wire to hold it on as I didnt fancy plastic cable ties



This is the tank on my pre-facelift 316





Stuck my phone right in the tank for this one!



I cant find smithys picture of the later style tank internals but im sure it had a type of baffle around the pump pick-up
Am I pissing in the wind with this tank?

[baptie0]

i think you are, unless you can sort out an external swirl pot with a large capacity.

[DanThe]

Anybody got a picture of the inside of a later tank to compare with?

[smithy318i]

as requested.

[DanThe]

Cheers smithy

So just to clarify that pipe feeds back into the pot right?

[smithy318i]

it does. 63L tank btw.

[DanThe]

Hope these havnt gone up in price too much as it looks to be the obvious solution

[appletree]

Just a thought, if your pumps not flowing enough then it should still have the same fueling issues when you go on the rollers.
It sounds more like your all getting fuel starvation to the pump after WOt and coming off round abouts (right hand bend) were all the fuel is on the left hand side of the tank or at the back, with the pump at the front right even a high flow pump wont pump if theres nothing there for it to pump.

These pumps also use the fuel to lubricte and cool the pump head.

Like someone else said a swirl pot with a lifter pump might be a better idea.

[appletree]

Ooops, that teaches me not to read just the first page.

[SM AUTOS]

I've just fitted a Walbro 255 in tank pump to mine, the cradle does need modifying, and 2 wires need to be soldered.

As others have said it is noisy, very noisy in fact, louder then when the standard pump was knackered, so something to consider imo, may not suit everyone.

I have the original tank and have never suffered from fuel surge, either with the standard pump or the after market one, and run it pretty low....

[DanThe]

Is there a rubber cover for the pump Steve?

I never had problems with the M50B25 but when I went to 2.8 I was getting starvation when powering round long right handers with less than 1/4 tank of fuel

[E30BeemerLad]

Hope these havnt gone up in price too much as it looks to be the obvious solution

63 ltr tank is now £165 + VAT from GSF, gone up from £105

[SM AUTOS]

Hi Dan

Nope no rubber cover/sound insulator for the pump, probably why it's so damn noisy..I had no problems with the original pump (well not until it spat it's dummy) but thought I may as well upgrade to a Walbro pump....which is just as well as I've now got a S50 to go in.....wasn't looking for one honest....

[DanThe]

If I were you id get it out and fit a rubber around it







Bought a tank from GSF today Lee, paid £125.35 inc VAT
They first quoted me £154 +

[SM AUTOS]

[quote="DanThe"]If I were you id get it out and fit a rubber around it

Are we still talking fuel pumps?

Yes you're right a rubber sleeve would probably make it alot more quiet, which pump have you fitted?

The Walbro pumps don't come with the sleeve afaik, was just really warning others of the noise if they decide to go down that route.

[DanThe]

The pump I used which is on page 2 came from eBay about 18 months ago, its the same one Dameon used and a few others, it was rated as 255 litres per hour but there doesnt seem to be any the same on ebay now

[blue30]

I just put one of the HRC pumps off ebay mentioned earlier into my m50, after the old one packed up completely. I think the old one must have been either not good enough or failing for quite a while because it's made a big difference to the drivability of the car. There's much more torque and the throttle response is much better.

I chopped the bottom of the cradle off first to try and fit a much bigger/fatter pump first before I realised that the bloody thing wouldn't fit through the hole in the tank. That was a bit of a DOH moment... this HRC is tiny though. I slipped some old fuel hose over the mount and used a metal hose clip to hold the new pump to it.

I'd say it was slightly noisier than the original but not annoyingly so, you mostly hear it when it primes, when you're moving you can't hear it.

edited to change, I meant to say *not* annoyingly loud!!

[DanThe]

Im not having much luck with mine, still getting major fuel surge with anything under 3/4 of a tank
This is how the pump is fixed to the frame



This is the fuel pot in the GSF tank im using, which I think is smaller than the one in a BMW tank



And this is the pot from an E36 328i tank, its over twice the size of the E30 pot



No room for a swirl pot as im using a 63 litre tank so there isnt space at the side, drilling the floor etc to mount a pot in the boot isnt going to happen either

[DanThe]

Has anybody used foam? Im thinking of ramming some of this in the tank

http://cgi.ebay.co.uk/Fuel-tank-foam-ty ... 500wt_1182

[RoadHazard]

How does the foam work? Thanks.

[DanThe]

Stops the fuel sloshing around, apparently takes up only 3% of the capacity

[tomson]

Has anybody used foam? Im thinking of ramming some of this in the tank

http://cgi.ebay.co.uk/Fuel-tank-foam-ty ... 500wt_1182

@£19 its worth a try Dan!