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MG MGA - Fuel pump mount

Does anyone have a diagram or dimensions of the bracket for the fuel pump? (The bit that bolts to the frame)
Art Pearse

http://mgaguru.com/mgtech/books/spl/spl_1500_d.pdf
Barney Gaylord

For USD 20 (including the rubbers) from Moss is it worth the effort of making one?
dominic clancy

Dominic, its no problem bashing and drilling a bit of ss plate. If I had to buy everything I need, I'd be broke!
Looks like my pump is not the same as shown - there are 2 adjacent ports.
Art Pearse

This probably isn't going to help much, as it's the same design as the one that Barney posted .. but a much clearer picture!


Robert Sinclair

Robert, exactly what I need! Thanks
Art Pearse

Art, I made one out of 16 gauge MS to exactly the same width as the frame bracket and height after bending was just a touch over 4". The bottom of the plate was, again,exactly in line with the bottom of the frame bracket and the top apex came to the edge of the pump housing (part 4080). The bend is enough to clear the heads of the two pump screws. I made it too long ago to remember whether it was to 'original' part dimensions or not............Mike
m.j. moore

Art - Sound like you have a AUF 300/AZX 1300 series pump used on the MGB and other British cars of that age. The mounting holes are closer together and oriented vertically as opposed to horizontally for the original pumps used on the MGA. The mounting bolts are also 5/16 BSF vice 1/4 BSF. The pump should be mounted such that the top hat looking cover that is held in place with 4 4BA screws is at the top. Cheers - Dave
Daved DuBois

Good on you chaps for persevering with SU fuel pumps! After several disasters I have fitted NZ-made Fuelflos to several MG's, they are so light that the rubber hoses support them quite satisfactorily. The only disadvantage is that they "tick" all of the time but this is inaudible when the engine starts.
Barry Bahnisch

Dave, yes the holes are closer - 1.75". Is the orientation you state necessary for proper operation?
Art Pearse

There is definitely a right side up. The filter port should be on the bottom for proper operation. If the pump is mounted sideways any debris stopped by the filter could collect on one side of the housing to obstruct internal ports and and perhaps bother the check valves.

If someone would send me the dimensions I would be happy to post a drawing of the part.
Barney Gaylord

Barney, this pump does not have a removeable filter. there are filters on each check valve. I'll send a pic.
Art Pearse

Art - The pump will operate in just about any orientation, just not as efficiently as in the correct orientation due to the flow smoothing chamber not being in the proper orientation. There should only be one filter screen internal to you pump, that is on the inlet valve. The mounting hole for the inlet valve is deeper to accommodate the screen. If a screen has been positioned over (or under) the outlet valve, you could wind up with an internal leak around that valve due to there not being sufficient to seat the screen, valve and the two gaskets for proper operation. Cheers - Dave
Daved DuBois

Dave, this is the pump. You are right, there is only the one internal filter disc, on the intake valve.
The mounting bores are both equal depth. As shown, the intake port is at the bottom. Is this the correct, or best orientation? Or can I mount it with both ports on top? If I had known the bolts were BSF I'd have taken more care of them!
Art


Art Pearse

Art - "As shown, the intake port is at the bottom. Is this the correct, or best orientation?"
Yes, that is the correct orientation.

"...can I mount it with both ports on top?"
You can, but the pump won't operate at full efficiency.

"If I had known the bolts were BSF I'd have taken more care of them!"
All of the fasteners and fittings in SU pump are BA, BSF or BSP. Cheers - Dave
Daved DuBois

Thanks Dave.
I adjusted the armature and it is working well pumping Varsol on the bench, and it halts when I block the discharge. When it is in the halt position, I assume the points are open and it only carries current when actively pumping?
I will mount it as you advise.
Art Pearse

Art - "When it is in the halt position, I assume the points are open and it only carries current when actively pumping?"

That is correct. You just don't want to block the inlet side - that will stall the pump with the points closed, causing bad things to happen to the pump. Cheers - Dave
Daved DuBois

This thread was discussed between 10/01/2013 and 13/01/2013

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This thread is from the archive. The Live MG MGA BBS is active now.