• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)

Correct SU Fuel pump for a BJ8 [ PSI specs] ?


Jedi Knight
Hello all,

I was researching to find the correct SU fuel pump for my 65 BJ8
and discovered that SU makes two different pressure rated fuel
pumps ;

AZX1307 = 16 GPH @ 2.7 PSI
AZX1308 = 16 GPH @ 3.8 PSI

The SU web site says the AZX1308 is the one and only correct SU
fuel pump that they make for the 65 Austin Healey 3000.


I checked the last electronic version of the SU that I received from our usuall parts supplier and discovered that
they had sent me a AZX1307 ( en ) which is the wrong pump per the SU web site ?

I suspect that this 1.1 PSI difference was designed for a good reason or SU would simply list one pump for all 2.7 - 3.8 applications ?

Does anyone on the forum know for certain that we need the 3.8 PSI rated pumps ?

Ed K.


Freshman Member
I just checked my box of parts. they sent me a AZX1318 (ELECTRONIC) ??? '66 BJ8.

the website says it's for a MG ??

looks like another phone call :frown:


Jedi Knight
Here is a link to the various SU fuel pump specifications that I found on the web. Just click on " full screen " to read the chart...

and here is a link to SU's web site ...


It appears that our usual supplier is always sending out the 2.7 PSI version of the SU fuel pump when the 3.8 PSI version is what is called for per the SU web site ?

I wonder what is going on with this ?



Freshman Member
i'm ok with lower pressure. On other cars, I've found too high is an issue. this SU stuff is new to me. even though I worked at a beck arnley parts store many years ago :crazy:

it looks like the 1318 is not polarity sensitive. so I should be ok.

Thanks for the Links, Will

Deleted member 8987

"Delivery pressure for either SU's or Webers should be in the 3.5 preferred - 4 max lbs per square inch range - unless you have made major mods to the carbs themselves."
Ref AZX1331. Fit near tank, 12 volt, 15 galls/hour at 2.7 p.s.i. As fitted to
MGA, Austin Healey 100 four cylinder

Apparently the 2.7 PSI is for a 100-4?


Jedi Knight
That article certainly points at the need for 3.8 PSI pump fuel pressure just like the SU web site lists only 3.8 PSI pumps for an Austin Healey 3000.

I am certain that SU would not go to the trouble to make two different pumps with the only difference being in the PSI rating if it did not matter !

Then why is our usual supplier sending out the 2.7 PSI rated pumps for our cars when SU lists only the 3.8 PSI pump for the 65 3000 ?

I guess I will have to ask them why they apparently are doing this by design, ( not a mistake since they send out more than one pump for a BJ8 at the lower than recommended PSI rating ).



Jedi Knight
I called Moss and the guy that answered didn't know but referred me to Michael Grant 805-681-3411 . I left a message with the question.
I'll report back when I get the answer.

Ed K.


Great Pumpkin
Country flag
it looks like the 1318 is not polarity sensitive. so I should be ok.

You will be OK with this " 1318 " Electronic pump if your car is Positive ground.

the SU pump is flow rate sensitive either the 1307 or 1308 style punmps will work on the later cars as they have the same flow rates.--Keoke


Jedi Knight
The Moss guy said that as long as the flow (GPH) was enough and the pressure did not exceed
7-10 lbs that it would work ok. They have had no complaints about low pressure.

He had no idea why SU made two different specifications ( 2.7 or 3.8 ) PSI pumps and only the 3.7
was listed for the Austin Healey 3000.

Interestingly enough, Moss's double ended SU they sell for an Austin Healey 3000 is
listed as a 3.2 PSI pump. The SU web site says this pump is no longer available and is
replaced by a double ended 3.7 PSI pump.

Similar threads
Thread starter Title Forum Replies Date
P TR6 TR6 fuel pump question - glass bowl pump correct? Triumph 8
J New Weber Dvg-correct fuel pump Spridgets 2
G ordering the correct fuel pump. Spridgets 7
N Correct Bulb Holder for BT7 fuel gauge ? Austin Healey 4
R correct fuel pressure Austin Healey 4
B Which is the correct door knob for a 59 bugeye? Spridgets 3
S TR2/3/3A Correct Starter Triumph 4
steveg TR6 Spec needed for correct ride height Triumph 28
Paulus TR6 Bumper Bars - what is the correct terminology Triumph 3
red57 What is correct wire harness outer wrap Austin Healey 17
dklawson GT6 GT6 Mk1 Oil Filter - Correct Part Numbers Triumph 2
S TR2/3/3A correct spire nut Triumph 4
J TR2/3/3A TR3A Throttle shaft bushing retainer plates, Correct color? Triumph 2
K Correct side screen nut for early 58 BN4 Austin Healey 14
drooartz The correct tool does make it easier [fill steering rack] Spridgets 4
I Correct orientation of the fan blades. Austin Healey 13
G Wanted Triumph TR4 [63] Period correct radio Triumph Classifieds 0
K Correct key head shape. Austin Healey 1
Gliderman8 TR6 Correct LED flasher relay Triumph 6
K TR2/3/3A Correct oil level for differential? Triumph 5
Jim_Gruber What is the correct Radiator Cap for a 948 with a Downflow Radiator Spridgets 4
BN6_2197 Correct run of the Choke Cable of BN6 Austin Healey 7
jfarris TR2/3/3A Which speedo is correct for a 1956 TR3? Triumph 8
L GT6 correct finish Triumph 5
Jim_Gruber What is the correct tool for removing brake lines from a BE Master Cylinder Spridgets 10
B MGA Correct wheel paint? MG 2
Gerald_Gordon TR4/4A Inconspicuous or period-correct backup light for TR4 Triumph 8
simon1966 Correct Jack for a 54 100? Austin Healey 5
C Need to order correct size Austin Healey 4
Joe Schlosser correct Dash board color Austin Healey 6
R TR2/3/3A Correct Thermostat? Triumph 7
simon1966 Correct horns for a 54 100 Austin Healey 5
B TR6 Title with correct VIN Triumph 8
BN6_2197 Question on correct oil temperature Austin Healey 15
G Correct spark plug ends - early BJ7 Austin Healey 1
BN6_2197 Correct adjustment of front axle of BN6 Austin Healey 14
S T-Series which way is correct MG 6
K TR2/3/3A Correct position for flasher bracket? Triumph 7
T GT6 These sills have been replaced, correct? Triumph 7
R Correct Brake Caliper colour Austin Healey 9
bighealeysource Source for correct washer for overdrive drain plug Austin Healey 6
C Correct mounting of exhaust on my 100-6? Austin Healey 9
Got_All_4 TR2/3/3A Throttle shaft assemble does this look correct Triumph 5
Rut TR4/4A Correct grill? Triumph 6
F MGB Correct steering wheel - 1974 MG 2
C Correct color of carb heat shield, starter, and generator? Austin Healey 12
R Cam gear nut correct torque Austin Healey 2
Jake Correct generator pulley and fan? Pics needed Austin Healey 5
T General TR Correct Engine Identification Triumph 2
J TR2/3/3A Correct trafficator control head? Triumph 4

Similar threads