Fuel Pump in earlier V8s

[John Keighley]

Thank you all for replying, I should have known where to look but as the car was going in to my local mechanic,didn't have time to search. It is on the right hand side of the boot floor. As it happened, the pump turned out not to be the culprit but we discovered this afternoon, the filter was almost fully blocked due to having sat around for an extended period of time. At this point, a new filter has restored normal operation. Since emerging from restoration the car has covered about 3500Ml, so I'll have to keep a lookout for crud in the fuel system.
John Keighley.

[pasini s]

Hello,

reading this thread made me wonder if I knew anything about the fuel pump
installed on my 409, and the answer was negative. I was quite sure that I
didn't see any mechanical pump in the engine bay so I asked to the guys at
the body shop (where my 409 sits now for some minor work) to check into the
boot. In fact the pump is there, exactly as described by Sam on his 410, and
looks like a double pump. This is a picture of my pump:

http://www.stefanopasini.it/Bristol_...uel_Pump_1.htm

I cannot see any numbers on it because it is installed in a position where
is not very easy to check; I would like to ask if anybody has any idea of
what model this pump might be and what could be the correct replacement for
this pump. Maybe an 'electronic' pump might be better? I have checked Burlen
site:

http://www.sucarb.co.uk/ProductCateg...px?ParentId=16

to find several types of double pumps, but I couldn't decide what would the
right choice be for my 409. high or low pressure? Points or electronic?

Thanks, as usual, for your help,

Stefano

[Sam410]

Mine was a double pump like yours, part number AUF406, equivalent to the AZX1404, which is in turn identical apart from the fittings it is supplied with to the AZX1405, sold by Burlen. I would presume that the AZX1405EN is simply an electronic version of the same pump. I'm no expert, but I suspect an electronic pump would give similar advantages and drawbacks to electronic over points ignition

This is what I put on the BOC Wiki about it at the time (July 2007):

"The fuel pump on my 410 recently gave up the ghost, and so I was obliged to investigate current replacement options. Burlen Fuel Systems were very helpful; my car had an SU twin pump, model AUF406, fitted as described above, in the boot. The AUF406 is now known as an AZX1404. The AZX1405 is apparently the same but comes with different fittings for the fuel lines, although if you are replacing a pump you would already have the correct fittings so it should be trivial to swap them over. Burlens offer a restoration service, but that (at time of writing) has an 8-week turn around, and costs only a few pounds less than buying a new pump. However, they also sell overhaul kits, which contain new diaphragms, gaskets, points, and all the consumables apart from the main coil. These were fairly straighforward to fit, and have the part number EPK300. You need two kits for the twin pump obviously. Mine initially still didn't work, but once I'd taken it apart, checked all the setup, and put it back together a second time it seemed fine. If the coil itself has failed (which according to Burlens is extremely unusual) the unit will need complete restoration or replacement and the overhaul kits will be of no use."

[pasini s]

Hello Sam,


thank you for your message. My pump looks very similar to the AUF406/AZX1404
that you mention, so I think that I could just order one and be safe with
that. I'm wondering if it is better to buy the electronic version AZX1405EN
or the classic 'points' type, though. Maybe some of you with a real
understanding of these pumps has a definite opinion on the possible choice?
It would be a great help.

Thanks

Stefano

[GREG]

I can understand having standard service items as spares,although none are rare on a V8, but I do not understand the logic of keeping items like fuel pumps.

However, what do I know !

[pasini s]

Hello,

I decided to stop worrying about my old fuel pump, that works fine but looks quite 'tired', so to speak, and I asked Burlen what pump would they recommend. They said that AZX1405EN is the right electronic pump to substitute my doubloe SU. I bought one and when it arrives I shall install it, keeping the old one as spare. I'll let you know what happens when I have installed the new one.

Thanks

Stefano

[Kevin H]

Originally Posted by GREG

I can understand having standard service items as spares,although none are rare on a V8, but I do not understand the logic of keeping items like fuel pumps.

However, what do I know !

The EFI system for my 411 (which is in boxes in my garage at the moment) has two fuel pumps, just in case one fails!

[john smith]

1969 383 - 411 (S1)
Some years ago I fitted the Edelbrock carburettor, fuel pump (model 1723)
and inline filter.
All work like a dream.
From the Edelbrock item description:
"Performer RPM Street Fuel Pumps
Designed for use with all Edelbrock carburettors used in Performer or
Performer RPM applications. The unique valve design improves flow quantity
and quality, and will support engines up to 600 hp. High-volume, 3/8" NPT
inlet and outlet surpasses the capacity of conventional models. Produces 6
psi and does not require a regulator. For gasoline only. Clockable lower
housing can be rotated for best inlet/outlet alignment."
JEVS