Electric fuel pump

[srm]

My pump is after the water separator and first filter, but before the engine mounted filter. I never gave any consideration to position relative to filters, just that this is the lowest point in the fuel pipe so significantly reducing the lift from a near empty tank. It works on my boat, no need to overthink it.

 

[B27]

My electric pump and prime bulb are fitted between the tank shut off valve and before the primary filter so I can prime / bleed the primary first the my secondary filter

If it's possible the diesel in the tank is dirty, the electric pump probably needs protecting by a filter.
If you're sure the tank is clean enough not to worry the pump, why even have the primary filter?

A squeeze bulb will work with fairly dirty diesel if push comes to shove. So I'm happy to have mine before the first filter.

An alternative might be to have an electric pump after the primary filter, and put in a tee and valve to circulate diesel back to the tank?

I think some fuel filters work better when the water/fuel hasn't been whisked up by going through a pump?

OTOH, lots of vehicles go just fine with in-tank pumps, with jsut a simple gauze or 'teabag' filter protecting the pump.

I aim to keep my tank clean enough that none of this matters. So far, so good.

 

[Stemar]

Another vote for bulb pumps. Mine are fitted between the tank and the main filter/water trap. The hand pump function on the Beta fuel pump strikes me as far too much like hard work.

 

[rogerthebodger]

If it's possible the diesel in the tank is dirty, the electric pump probably needs protecting by a filter.
If you're sure the tank is clean enough not to worry the pump, why even have the primary filter?

That depends on what type of electric pump you are using.

If you are using a gear or vane pump yes they need a filter before the pump but most fuel pumps are like diaphragm pumps with one way valves on input and exit of the pump just like a henderson MkV or bilge pumps that cane take lost of crud.

If you are concerned in grit getting in your pump you should us a sediment filter before the pump

I do have a transfer pump as I have 3 tanks and can transfer from one tank to another or just circulate fuel to the same tank

Tis transfer pump draws via the primary filter then sending the fuel batf to the same tank or to a different tank via selection valves

I also built a fuel polisher using a high flow mains pump and 3 stage filters. The pump is a gear pump so a sediment filter is before the pump and a 1 " BSP fine filter before discharge bach to the tank a such a rate the the fuel in the tank is stirred up greatly to ensure the bottom of the tank is stirred up

 

[rotrax]

I've had a Facet pump for a decade ... still going strong. And as belt and braces I also have an inline squeezy bulb - useful when bleeding after filter change.
I bypassed the engine fuel lift pump which was misbehaving yonks ago- and have never got round to fixing it!

In any case engine will run through gravity with pump turned off ..as tank is higher up.

Our genset uses a genuine Facet, the 110HP Yanmar main engine has a chinese copy-about 15 quid IIRC.

Both appear to be very reliable.

 

[ghostlymoron2]

I had an electric fuel pump on my moggy minor - several times I had to clout it with something hard to get it working. I believe most modern cars use mechanical fuel pumps as more reliable.

 

[rogerthebodger]

I had an electric fuel pump on my moggy minor - several times I had to clout it with something hard to get it working. I believe most modern cars use mechanical fuel pumps as more reliable.

The fuel pump on a morris miner was an SU electric pump the same as on my MG

The points at the back end of the pump would get water in and corrode.

Giving the pump a wack would get it working again.

I fitted the SU pump in the boot of my MG so no more issues with crud on pump points

 

[srm]

I had about three Morris Minor ex GPO vans, an early MM traveller, an MG Midget and an MGB over a fair number of years. All old vehicles near the end of their working lives. No idea where the fuel pumps were as not one fuel pump problem.

 

[rogerthebodger]

Fault Diagnosis | SU Carburetters

Item b) is the issue I am referring to but item a) bad 12 V connection to the pump could also be the issue

A good bash often vibrated the connection of points get the pump working again

 

[Stemar]

I had an Austin 1300 that I tweaked with a decent head and Reece Fish carb. It went quite well, but the poor old fuel ticky fuel pump couldn't keep up above 90, so I'd get to 95, then the engine would cut until I slowed a bit then push me on for a bit. Rinse and repeat