Having now acquired a 2.8 BMW engine for the Viento, I now need to source a suitable fuel pump. Having looked on e-bay there seems to be a vast array of options and an equally vast array of prices. Facet pumps and the associated mounts seem cheap, but I am not sure that they work with injection engines (some seem to specifcially say that they don't). Other pumps have a big price range and even the mounting brackets can be expensive and I don't get the link between pressure and BHP. What sort of pressure and flow rate should I be looking for? Any advice or recommendations would be appreciated. The following are a couple of examples:



COMPETITION fuel pump bracket, race/rally,trackday, kit on eBay (end time 12-Dec-10 13:06:34 GMT)

D2A 255 305 LPH HP FUEL PUMP BMW E30 E36 E46 M3 330I on eBay (end time 07-Dec-10 15:41:12 GMT)

Steve

Just get a standard 328 fuel pump, mount it in the top of the tank, its got a level sender built in too. My m3 pump which is the same as a 328i pump runs at 49.7psi.

Most fuel injectors run in the 2.5 - 3.5 bar range. I've used several different pumps on different project cars, Bosch, aftermarket and far eastern. I've never had problems regulating fuel pressure / air fuel ratios at or near WOT. My approach was to find an engine of similar spec to what I was aiming for and use a pump for that model. I'm pretty cheap and for one car I spent a morning finding pumps at the scrappy which looked suitable. I've also purchased new from eBay. Just make sure the pump is always fed with fuel while it's running - they hate running dry.

James

NEW Electric Fuel Petrol pump JAGUAR XJ, XJS, XJSC etc on eBay (end time 19-Dec-10 16:10:36 GMT)

One of these will do the same job at half the price, v12 jag will use more than a BMW.

The regulator controls the pressure so you just need huge flow.

Just use a coil bracket to mount.

Thanks for the advice. I think that I will go for one of the £40 external pumps. With regard to the bracket, I thought that the mounting needed to be flexible or mounted on rubbers or something (I guess for vibration damping). I could fabricate a solid bracket from sheet aluminium if thats all thats needed.

Also, do I really need a swirl pot? The old Velocity build manual that I'm using does not mention it, but I know that some people have them. Perhaps its just a case of finishing the build without one for simplicity and then retrofitting later - I'll just have to make sure that I don't run too low on fuel in the tank.

Regards
Steve

Stev,

You need a bit of a sump in the tank or a swirl pot to ensure that the F/I pump is not starved of fuel during cornering - they use the fuel as lubricant in the pump and it will strip itself pretty quickly if you run it dry for a while.

In terms of brackets and damping I just used ali sheet as u suggest with 3mm foam stuck to the inside - works a treat and very LCB...

Neil.

Steve,

Mount it with some of these, they work well.

http://www.cbsonline.co.uk/rubber-rivnuts-451-c.asp

Thanks. I'll go for the fabricated ali bracket with rubber riv-nuts as I have some sheet ali from my local recycler that I got for scrap metal cost.

This might be a daft question, but is it possible to put a small external sump on the tank. The tank that I have (and the ones that I've seen) don't have anything that I would recognise as a sump, just a fuel outlet close to the bottom of the forward facing tank wall. I was trying to avoid the complication of putting a swirl pot on due to the need for a secondary pump - at least the flow diagrams that I've seen have a second pump. However, if I need to do this, can anyone recommend a suitable secondary pump.

I didn't realise that getting the fuel from the back to the front of the car was going to be so complicated

On the fuel tank that I had TrevD make for my Viento (injection engine) I got Trev to put a small, low box on the underside with a fuel outlet on it to act as a swirl put. Works a treat. You will find some pics in my archive on this site.

quote:

---

Originally posted by SteveWallace
Thanks. I'll go for the fabricated ali bracket with rubber riv-nuts as I have some sheet ali from my local recycler that I got for scrap metal cost.

This might be a daft question, but is it possible to put a small external sump on the tank. The tank that I have (and the ones that I've seen) don't have anything that I would recognise as a sump, just a fuel outlet close to the bottom of the forward facing tank wall. I was trying to avoid the complication of putting a swirl pot on due to the need for a secondary pump - at least the flow diagrams that I've seen have a second pump. However, if I need to do this, can anyone recommend a suitable secondary pump.

I didn't realise that getting the fuel from the back to the front of the car was going to be so complicated

---

Same as I've got - had Luego make me a tank with a collector at the bottom that has an out feed. That said, I still have a swirl pot in the engine bay to make sure that there is no starvation.....

quote:

---

Originally posted by jollygreengiant
On the fuel tank that I had TrevD make for my Viento (injection engine) I got Trev to put a small, low box on the underside with a fuel outlet on it to act as a swirl put. Works a treat. You will find some pics in my archive on this site.

quote:

---

Originally posted by SteveWallace
Thanks. I'll go for the fabricated ali bracket with rubber riv-nuts as I have some sheet ali from my local recycler that I got for scrap metal cost.

This might be a daft question, but is it possible to put a small external sump on the tank. The tank that I have (and the ones that I've seen) don't have anything that I would recognise as a sump, just a fuel outlet close to the bottom of the forward facing tank wall. I was trying to avoid the complication of putting a swirl pot on due to the need for a secondary pump - at least the flow diagrams that I've seen have a second pump. However, if I need to do this, can anyone recommend a suitable secondary pump.

I didn't realise that getting the fuel from the back to the front of the car was going to be so complicated

---

---