23 replies to this topic

[miniGTS]

My mechanical fuel pump failed after it's been standing for many years. I decided to get an electric fuel pump and just got a universal one that I belive is referred to as a solid state pump, cube shaped.

I wired it up and when I turn the ignition on, the pump seems to run constantly. Is this normal or is it a sign of a leak in the system?

[Spider]

Facet or a Facet copy ? Yes, that is what they do.

[miniGTS]

It's a copy.

[Steam]

Yes they run continually but you should be able to hear a sound difference between pumping and idling.

[whistler]

Fit an Ecco one from Fuelflow. They behave like the old SU pump. Only hear a ticking when it's actually pumping. Been using them for years. Made in NZ.

https://simonbbc.com...r-installation/

[miniGTS]

Thanks for the feedback. I'll look into other options at a later stage. For now I just needed something quickly and that works. It was cheap enough at the local auto parts place so happy with it for now. I'll just mount it on some rubber mounts.

[whistler]

Thanks for the feedback. I'll look into other options at a later stage. For now I just needed something quickly and that works. It was cheap enough at the local auto parts place so happy with it for now. I'll just mount it on some rubber mounts.

Make sure it's not running at more than 3 psi, which is what SU and the Ecco pump run at otherwise you'll probably need a pressure regulator.

[miniGTS]

How will I know if it's running at more than 3psi?

[miniGTS]

I have twin Su hs2 carbs and from what I see online, 4 to 5 psi is fine for twins.

The pump I have says 0.03mpa which is just over 4psi

[Steam]

4 psi should be fine. There is only problem with higher psi if it ovecomes the float valve needle thus causing flooding.
Pressure regulators can cause more problems than they fix.

[miniGTS]

I haven't noticed any flooding or float bowl issues yet. I have however noticed a leak at the pump. It looks like it's leaking at the threaded unions where the hoses fit. I'll try to tighten it up a bit more but I'm pretty sure it's as tight as it'll go.

[miniGTS]

After fitting a mechanical SU I found in my parts buckets, it worked fine for a short while but have recently noticed petrol in the oil. I don't think the carbs are running That rich and assume the only other way that can happen is with a failed mechanical fuel pump cause fuel to get into the wrong side of the engine.

I haven't seen petrol leaking out the bottom of the pump though.

Instead of the cube electronic fuel pump I tried previously, I got a Huco pump rated at 0.25bar at the pump.

I'm hoping this will be OK with the twin hs2 carbs.

Anyone else use the Huco 443000 fuel pump? I chatted to a guy locally who uses it on his mini with a hs4 without issues.

[miniGTS]

I'm wondering if something as simple as an inline fuel tap can successfully reduce fuel pressure. Anyone tried it?

[68+86auto]

If I remember correctly, at one point you had fuel leaking from the manifold? That would've also filled the sump with some petrol.

 

 

I'm wondering if something as simple as an inline fuel tap can successfully reduce fuel pressure. Anyone tried it?

 

That won't work.

 

It could reduce the pressure when there's flow though. It is a restriction and the pressure drop will vary depending on the flow rate. when the float bowl is full, the full pressure will still occur.

Edited by 68+86auto, 30 October 2024 - 11:30 PM.

[miniGTS]

If I remember correctly, at one point you had fuel leaking from the manifold? That would've also filled the sump with some petrol.

Ahhh, yes correct. Though I checked the oil after that and if there was petrol in there, it wasn't as obvious as it now.

I'm wondering if something as simple as an inline fuel tap can successfully reduce fuel pressure. Anyone tried it?

That won't work.

It could reduce the pressure when there's flow though. It is a restriction and the pressure drop will vary depending on the flow rate. when the float bowl is full, the full pressure will still occur.

OK, thanks, makes sense. So a pressure regulator has a chamber that hold fuel before it gets sent to the carbs at a consist and reduced pressure?