xgrudgex

They are back on the site!

HiWind

is there not a risk of flooding or getting backfires on start up with the priming version?

John McM

I have one. It hasn't made my car backfire on start.

JasonAndreas

The DME control unit will not open the injectors until the engine is rotating faster than 30RPM.

HiWind

thanks JA ... so if pump is running where is the excess pressure (ie above the 3-4bar as required) going? ie imagining one left the ignition key turned to first pos for longer than normal?

John McM

Through the fuel pressure regulator back to the tank?

HiWind

^^ right you are John thanks

thunderdeep

Any feedback from people who have the fuel prime version for a 993? Should I get one or just the basic solid state version without fuel prime? I'm not quite sure which one to get. My current mechanical relay (2nd one now) is on the way out... car stalls at idle on cold start...

rkwfxd

Ten minutes ago I didn't know this even existed. Now I have one coming.

Silvertarga

I went with the priming version and am, pleased with it, car starts much easier..not daily driven

kreeshp

993 owner with pump prime relay checking in. Not sure what kind of feedback you are looking for. It works as advertised; the fuel pump activates prior to start up.

Does one need it? No. Is it good to have? Probably? Is it worth the extra cost? Can't answer that for you.

The non pump prime relay version would suffice but as with many things, we Porsche owners tend to obsess over and over-analyze things more than we should.

Auto_Werks 3.6

I have the pump prime version for my 944 turbo track car, where the restrictive fuel pump check valve has been removed from the system. It's a huge improvement for that car since all the fuel pressure drains back to 0 almost immediately.

I bought the regular solid state version for my 911, because if the rest of the system is 100%, it shouldn't really matter. Adding the pump prime feature certainly shouldn't hurt anything, and it would definitely help as a band aid if any parts of the system aren't perfect.

Earlydays

I use the "fuel prime" version and the car definitely starts better.....

JasonAndreas

With the stock DME relay the fuel lines reach operating pressure before the engine hits 30 RPM when the injectors open so I am curious how this could be? The primed and non-primed version should make no difference to the 964 and 993?

HiWind

thanks for the reviews - ordered and price dropped $10