What is the proper procedure for priming S.U.175's

[Winston]

Well, At the moment I'm at the computer with an aftermarket fuel pump on it's way,I hope. The diaphragm leaked upon install of the "new" one so back it went.
I'm just sittin here thinkin that I never have primed dual carbs from a dry start, any help out there?

Thanks

Winston 67 TR4A IRS

 

[aeronca65t]

I may be off-base here, but I think your fuel pump should have a little pump-arm on the side. Move the arm up and down a bunch of times and it should fill the carb float bowls with fuel.
I had a TR-3 with a TR-4 engine and it had this feature...most Spitfires do too.

 

[Geo Hahn]

<blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by aeronca65t:
...your fuel pump should have a little pump-arm on the side...<hr></blockquote>

Unfortunately all the aftermarket pumps now available lack this feature.

With luck you won't have to prime at all though it may be helpful to have a 1/2 to full tank of gas. The fuel pump on a TR3-4 is lower than the tank -- but just barely.

If the tank is almost empty it may need some help getting fuel to the bowls. In this rare occasion I have used an inline electric pump to get things started.

[ 04-19-2004: Message edited by: Geo Hahn ]</p>

 

[piman]

Hello Winston,
all that is required on a non manual priming pump is to crank the engine. You may like to take the plugs out to ease the load on the starter but it won't take long to do. However if the car has run recently the float bowls should be reasonably full anyway.

Alec

 

[sammyb]

If you have the priming lever on the pump, squeeze it three or four times. If you don't, you can just pour a little fuel into each float chamber on the carbs if you don't want to crank too much on the starter.

The car will get fuel to the engine rather quickly.