SteveWallace
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| posted on 24/11/10 at 08:06 PM |
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Fuel Pumps
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
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franky
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| posted on 24/11/10 at 08:20 PM |
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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.
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SeaBass
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| posted on 24/11/10 at 08:22 PM |
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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
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mark chandler
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| posted on 24/11/10 at 08:40 PM |
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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.
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SteveWallace
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| posted on 4/12/10 at 05:10 PM |
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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
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NeilP
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| posted on 4/12/10 at 08:29 PM |
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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.
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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Jimfin
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| posted on 4/12/10 at 10:02 PM |
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Steve,
Mount it with some of these, they work well.
http://www.cbsonline.co.uk/rubber-rivnuts-451-c.asp
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SteveWallace
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| posted on 4/12/10 at 10:33 PM |
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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
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jollygreengiant
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| posted on 5/12/10 at 02:29 AM |
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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
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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richard thomas
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| posted on 5/12/10 at 06:16 AM |
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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
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