9 replies to this topic

[minicab]

Hello all Minilovers.

 

I hope someone can recomend me a SU Electic fuel pump for my car ?
I want to place the fuel pump in the engineroom in the same height as my carburator and I need a fuel pump who will fit my engine.

I was recomended to use the fuelmpump SU AUA25 but it has problems to deliver enough fuel when I drive at the highway over aprox. 65 mph.

I know that older SU Pump was installed under the hood.

The engine is a:
4 cyl. 1275 cc. (MG 1300 Mk II - 1970)
MG 1275 cylinder head. 12G940 unleaded converted.
Block drilled to +20. and larger pistons.
Kam. 276 Megadyne road rally
SU HS4 carburettor with aluminum inlet.
Tubular headers. LCB 2-1


Kind Regards
Anders
 

 

[nicklouse]

Sorry but I would not place a pump there.

[dklawson]

Do not put the pump in the engine bay and do not put it at the level of the carbs.

 

One of the benefits of electric pumps (particularly in hot climates) is that mounting them low and outside the engine bay helps prevent vapor lock.  

 

All pumps work better as pushers than pullers.  If you mount the pump high, it has to draw the fuel up before pumping it to the carbs.  This is hard enough on the pump but in some instances it can cause the pump to loose its prime.  That's a bad thing.  Heat from the engine compartment can make this worse.

 

If you want to fit an electric pump for use with SU carbs, look for a small electric model that can deliver fuel at 1.5 to 3.5 PSI.  Mount it under the left hand fuel tank like the factory did when it installed electric pumps.  Use a coarse filter between the tank and pump to keep big debris out of the pump's valves.  Use a fine, translucent, disposable filter in the engine bay right before the carbs to catch any debris that made it through the pump.  Almost any automotive fuel pump you find will provide sufficient flow for your car's configuration.

[AlexMozza]

I like the sound of the Engineroom  

[minicab]

I like the sound of the Engineroom

Well my first language is swedish so its explains that I cant found the "right" word

[minicab]

Thanks for the answer.

 

Thanks for the advice.

 

I know that the before 1970 years models. The Minis had the fuelpump under the left fuel tank.

 

Regards Anders

 

Do not put the pump in the engine bay and do not put it at the level of the carbs.

 

One of the benefits of electric pumps (particularly in hot climates) is that mounting them low and outside the engine bay helps prevent vapor lock.  

 

All pumps work better as pushers than pullers.  If you mount the pump high, it has to draw the fuel up before pumping it to the carbs.  This is hard enough on the pump but in some instances it can cause the pump to loose its prime.  That's a bad thing.  Heat from the engine compartment can make this worse.

 

If you want to fit an electric pump for use with SU carbs, look for a small electric model that can deliver fuel at 1.5 to 3.5 PSI.  Mount it under the left hand fuel tank like the factory did when it installed electric pumps.  Use a coarse filter between the tank and pump to keep big debris out of the pump's valves.  Use a fine, translucent, disposable filter in the engine bay right before the carbs to catch any debris that made it through the pump.  Almost any automotive fuel pump you find will provide sufficient flow for your car's configuration.

[dklawson]

Your English is better than my Swedish.  You do not need to apologize!

 

I should have mentioned when I responded earlier, you asked about an SU fuel pump.  Any electric SU pump will be able to meet your car's requirements.  It is the aftermarket (non-SU) pumps where pressure will be a problem.  That being said, don't buy a 50 year old pump off of a Jag or something.  Get a new or reconditioned pump of the AUF214 type.

[Spider]

I'd suggest along the lines of what the other guys have said ie, mount it low, like in the rear subframe.

 

If however, you really do want to mount it in the engine bay, the only pump I was able to find that had the correct pressure and also enough lift was the ones fitted to the Morris Minor. While Facet list one, they only manufacture them to order.

[KernowCooper]

As above the Morris Minor/1000 had a SU pump at the front and that was a pump which was of lift design

[nicklouse]

Ok I know they can be funny in Sweden at Bilprovening but I still would not be putting a pump in the engine bay. Any real reason?

The one for the old Morris might state enough flow and pressure but as soon as you start accelerating you and putting even greater loads for the pump to overcome.

A decent facet solid state pump in the rear. And a pressure regulator on the front bulk head is all you need.

have they finished all the road works on the 45 up to Trollhattan? Been I while since I have been up and down that road.