• Hi Guest!
    You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

Remounting my SU fuel pump

Share this page

ncbugeye

ncbugeye

Jedi Warrior
Offline
I am having ncbugeye's SU fuel pump restored by Dave Dubois and I think he is about finished with it, I am expecting it in the next couple of weeks.

The mechanical pump from the original 948 is obviously long gone, this one is a traditional SU electrical one, and it WAS pos-earth until Dave rebuilt it, so it is probably not from the donor 1974 Midget, and I have no idea where it came from.

Anyway, I am thinking of reinstalling it in the rear, not normal for a Bugeye, so does anyone have any recommendations as to where? I was told do NOT under any circumstances try to put it in the cave, for safety reasons. While I am at it I think I will replace the fuel lines rather than messing with trying to rebend the old ones.

Advice welcomed.
 
I personally would place it exactly where BMC did, behind the back axle and in front of the tank. Running a wire back there is more convienent than getting vapor lock if you put it too far from the tank.
Bill
 
I would put it close to where the original was. Clean and easy to get to. Looks good too........
 
Mine here along with the fuel filter.....
 
Hello Chris,

it will probably be OK at the rear as most S.U. pumps are located there. But it is probably a good idea to check what vehicle the pump came from as, although S.U. pumps look the same, there is a design difference between pumps that are fitted to the front of the car (Morris Minor for one) and those that are fitted near the rear.
Neither type will work well unless they are located where they were designed for. Crudely put, the one type is a short suck and long blow (rear mount) and a long suck, short blow (front mount)

Alec
 
Well, it's still on its way from Bremerton WA at the moment, but when it arrives I'll post a pic and the part number. All I know is it obviously isn't the original Bugeye pump because that was mechanical attached to the side of the engine block. Is there any external physical way to recognize short/long from long/short?
 
Re: SU pumps. There really are pushers and pullers, but I have in my past successfully moved Mini pumps from the rear (pushers) to the bulkhead under the bonnet to work as pullers, and they were always o.k.
Maybe they were grateful for being moved from all the mud and grunge under the car?
 
Mud?

Grunge?

Where?

This baby is 48 years old and has no rust, and I intend for her to stay that way.

Here is a pic of the restored pump which arrived today. This shows how nice a job Dave Dubois does - I wish I had a before pic. It is an AUF305 converted to neg-earth.

Can anyone tell me of it is designed as a pusher or a puller?
 

Attachments

  • 5633-IMG_5382small.jpg
    5633-IMG_5382small.jpg
    28.6 KB · Views: 60
The old "L" type pump was rated at 42" maximum suction lift & intended for front mounting. The type "HP" was rated at 30" maximum suction lift & could be used rear mounted. The types "AUF" & "AZX" are rated at 18" maximum suction lift & intended for rear mounting. This would make your AUF305 a pusher.
D
 
Thanks for that, I thought it might be so.

Another question: assuming I am going to mount it at the rear, which wire in the Bugeye wiring harness would be a good place to tap in to give the pump its power supply?

Also, could someone post a pic of where later Spridgets install the pump, at the back. The AUF305 was installed (presumably) when the 1275 was put in by the PO, and was mounted up front on the back slope of the left-side front wheel arch, until it failed.
 
Hello Chris,

I believe you will have to run a new cable to feed the pump. It is normally fed directly from the ignition switch 'white' circuit that feeds the coil. (Note unfused.)

The reference to mud and grunge on a mini is because that pump was mounted on the rear sub frame and got covered by everything the road wheels threw up.

Alec
 
I long ago mounted an AUF in the Elan, inside the trunk. It replaced the mechanical, block mounted one. Never had issue with the setup. It feeds two 40 DCOE 18 Webers easily. Had to route a feed wire to it from switched iggy circuit and a ground wire (frozen snot car, y'see). Did put a dash mounted switch in the circuit as well, for fuel cutoff and theft recovery. Figger'd I could get to it on foot before any miscreant found the switch and re-lit it. /bcforum/images/%%GRAEMLIN_URL%%/wink.gif
 
Alec,

I remember only too well, I owned a Mini back just after the earth's crust cooled enough to go wandering about. (1969-72)

It was a 1964 Mini Traveller (woodie) with a modified head and it was fun and fast for an 848cc single carb. It did Croydon to Durham on the M1/M18/A1 once every three weeks or so for about two years. Strangely though, I never had a moment's trouble with the fuel pump, although I had lots of trouble with almost everything else, particularly and regularly the front brakes.
 
Back
Top