Recommendations on external EFI fuel pump?

[Quagmire]

Guys,

Need some direction on what might be a good external EFI fuel pump to run the 3.5 in my P6. Something inline is preferable for ease of plumbing.

I was sure that some older GM cars had something like this, but searching ebay on my phone (its blocked here at work) is pretty tedious.

Any pointers? Ideally looking for a general list of makes/models that I can ebay for or find in a scrappy somewhere.

Cheers

[SimpleSimon]

This seems to be a pretty standard fuel pump for EFI in fact the V8 TVR cars use the same pattern, if it was me I would be looking for a Bosch branded unit purely for the reliability angle IMO http://www.ebay.co.uk/itm/Sytec-Univers ... 53fae95a11

[DaveEFI]

Guys,

Need some direction on what might be a good external EFI fuel pump to run the 3.5 in my P6. Something inline is preferable for ease of plumbing.

I was sure that some older GM cars had something like this, but searching ebay on my phone (its blocked here at work) is pretty tedious.

Any pointers? Ideally looking for a general list of makes/models that I can ebay for or find in a scrappy somewhere.

Cheers

Obvious one would be the SDI (Vitesse) one which is external to the tank. But is gravity fed - so needs to be below it. Connections are by rubber hoses.

[chodjinn]

Bosch 910 pump will do up to 300bhp, and can be bought for £50. Plenty of people use them, I had one on the old MG. I now have one of the Sytecs (above) but only because that came in a deal when I bought a full fuel system for the Skyline; I'll be using the sytec in the new MG as will be needing bigger for the 'Line.

[ChrisJC]

Pretty sure early fuel injected Vauxhalls, e.g. Cavalier, disAstra etc had something. I think I had a Cavalier pump on my EFi Landie for a while.

Chris.

[stevieturbo]

As others say, early Cavaliers, Golf's, MG turbo etc etc all used a simple pump.

Usually a 12mm push on hose in, and 8mm push on hose out

ie like this ( although this is not genuine Bosch )

http://www.ebay.co.uk/itm/APS-Universal ... 5d41220943


Some people will say there are two types of pumps.

ones that will give you hassle, and Bosch....which does seem fairly accurate.

This one claims to be genuine Bosch

http://www.ebay.co.uk/itm/1x-Bosch-0580 ... 53f08001f0

[Ian Anderson]

Bosch 044 I would recommend

Never let it run dry, after 3 seconds dry running it will kill the parts and become extremely noisy and give reduced flow and pressure

is much so that once you have installed it suck some fuel into the pump before turning it on for the first time

Also it needs to be lower than the tank as it does not suck the fuel very well

So fit it near the tank

Ian

[stevieturbo]

For such an engine, it makes no sense to use a more expensive pump with some 4-5x the flow capacity the engine will ever need. To say an 044 would be overkill is an understatement.

A basic cheaper Bosch with push on fittings such as the above will be more than enough for virtually any n/a Rover V8

No efi pumps suck very well.

All must be gravity fed with a good clean and uninterrupted supply of fuel at all times.

[DaveEFI]

Trying to remember my basic physics - but can any 'high pressure' pump suck? Don't cars with a low tank have two pumps - one to raise the fuel to the second which does the high pressure?

[stevieturbo]

Trying to remember my basic physics - but can any 'high pressure' pump suck? Don't cars with a low tank have two pumps - one to raise the fuel to the second which does the high pressure?

Yes they can, if they were designed that way in the first place.

Most EFI pumps have not though, as they dont need to suck.

And no, a car with more than one petrol pump would be very unusual. Some do exist, but very very few.

Usually the pump is in the lowest or main tank, and if there is another tank or a divided tank, most efi systems have a syphon pump powered by the fuel return to draw fuel from the dead side of the tank.
I think Ive heard of a car that uses an electric pump for that same task...might have been a diesel though.

Some modern cares have weird tank shapes, and can be divided by a hump in the middle where the exhaust etc passes through, which is where a secondary or syphon pump comes in

[Ian Anderson]

My car is unusual!

It has a low pressure pump feeding a swirl pot and then a Bosch 044 feeding the fuel rail

Reason for this is on a GT40 the tanks are long and narrow in the side sills and when you brake the furl sloshes forward leaving the tank outlet in air

The LP pump feeding the swirl can take sucking air the Bosch 044 can not

Ian

[scudderfish]

Mine is unusual as well. It was originally carbs, so when I switched over to EFI I left the original pump where it was to feed a swirl pot in the engine bay. I put in a return line back to the tank in the rear. I've then got a Bosch pump and HP filter in the engine bay feeding the fuel rails.

[Quagmire]

On the P6 the tank is in the boot, and all the pipework comes out the bottom (Crazy!), sealed in a very similar way to a series landrover tank. The pump would therefore be below the tank.

I currently have a super old Facet gold top feeding the carbs, and have moved the reserve tap to the back so that it is still plumbed in (I need to fit a longer cable though).

I was thinking that I could try and use the Facet to feed the EFI pump, otherwise I would lose the reserve feature- meaning I would end up running on reserve all the time and have a superfluous knob on the dash. The reserve on the P6 is just a sump at the bottom of the main tank with a lower outlet than the main.

Space will be tight though...

[stevieturbo]

It's looking like you may need to move to some sort of swirl tank arrangement with a lift pump and then the efi pump

With full proper flow/returns.

[scudderfish]

If it helps, my fuel system is basically two circuits linked at the swirl pot.

Circuit A is
Tank -> LP pump -> swirl pot -> tank

Circuit B is
Swirl pot -> HP pump -> fuel rail -> swirl pot

(with filters and regulators in there as well)

The LP circuit keeps the swirl pot full, the HP circuit feeds the engine.