Its happened to my car???????

[porschetub]

Since I haven't posted on this forum for sometime I've enjoyed being back so I got the motivation to sort a few issues on my own car,the list:
Electric windows - done
Refit rear vision mirror - done
Fit new waterpump hose - done
Fix handbrake light - started
Fit new rear speakers - done
Fix headlight linkages - done

Then I'am ready to get the car its road worthness test (warrant of fitness here in New Zealand) and hopefully back on the road after about a year .
Cars ready to go for the test and stalls after I started it,fuel was low so I put in 5 litres and it has'nt run since??????.
Have tacho movement on cranking ,good power @ relay board,jumpered the relay but have no power @ the pump, (no fuel in the fuel rail is proof of this).
Why have I no power @ the pump after running a jumper on the relay board?,
pumps tests ok ,need some fresh idea's thanks.

[John_AZ]

Dean,

Thinking, thinking, thinking ---at work.

But,

You put a '89 2.7 engine in your early 85.1 944 A terrific project for an engineer.
You have had some harness issues, mostly solved.

Before you put the 5 liters in, did the car run/start/idle?

Later
John

[porschetub]

Thanks John,firstly the car was running/idling well and I had been driving it over the last week or so,while the car has been off the road it has been run and started many times.
When it cut out while idling I kind of knew it was something other than fuel as it cut out quickly and didn't stumble like it was running out of fuel.
Yes it was an interesting conversion not the plug and play I was told it was,not made easy by the fact it was auto to manual and left hand drive to right hand drive.
By the way the tank had plenty of clean fuel in it when drained I got out around 12 litres.

[Dawgz83948]

Originally Posted by porschetub

Thanks John,firstly the car was running/idling well and I had been driving it over the last week or so,while the car has been off the road it has been run and started many times.
When it cut out while idling I kind of knew it was something other than fuel as it cut out quickly and didn't stumble like it was running out of fuel.
Yes it was an interesting conversion not the plug and play I was told it was,not made easy by the fact it was auto to manual and left hand drive to right hand drive.
By the way the tank had plenty of clean fuel in it when drained I got out around 12 litres.

I would suspect it may be a wiring issue. On the V8 boards they show the underhood pinouts of the early and late car. I would look at those and make sure everything is connected accordingly.

[porschetub]

Yes points to that but why good then bad so quick?,I think I can jumper the relay and put an independant supply to the pump it should run right??? ,there are reasons why it may not

[John_AZ]

Dean,
Have you ever checked and replaced the early ignition switch?

This is often a problem.
Here is a recent thread:
Post 4 in particular...

Starting New engine problems - Rennlist Discussion Forums

Still thinking....

John

[porschetub]

John some questions;

This switch is from a early VW golf is that correct ? (I may have one)
Why would I have good cranking speed @ my starter with a bad switch?
Would I have a switch failure while the car is running? (seems unlikely)
Stereo ,headlights on don't effect cranking speed @ starter?

Don't for a minute think that I'am picking @ the answer you have supplied it's more the level of my own frustration than anything else, my "Porsche experience" has been a little soured after the hassles I've had with this car.
Have you noticed all the "no start" posts lately,I feel I'am standing in a line

Again ,thanks Dean.

[John_AZ]

Originally Posted by porschetub

When it cut out while idling I kind of knew it was something other than fuel as it cut out quickly and didn't stumble like it was running out of fuel.

Since you have not had your "eureka!" moment and posted [B]solved[B]...

Help me. It may be something very obvious.

If it is not the fuel, I can only suggest the most basic quesions for a "no start" situation.
Sorry if you have tried or heard these before.

Did you replace the fuel filter?

Check and clean all the grounds and connections to the battery.

When it was idling, before it stopped, what were you adjusting? Any vacuum line, connector, ground, injector,wire?

Wiggle the main wire to the DME.

Check that all fuses are tight and the connections clean. Replace any fuses that are not ceramic style--no plastic fuses.

When you drained the fuel, could there be an "air pocket" in the lines?

Have you checked the fuel pressure at the rail? The fuel pump could have failed during the "drain & refill" time due to burnout.

Now that there is 5 liters of fuel in the tank, does the new fuel drain out when you remove the fuel line attached to the fuel pump? Could the tank be clogged at the [B]in tank fuel strainer[B]? If the strainer was cut or damaged, a lot of in tank debris could have gotten into the fuel pump.

Is the fuel pump check valve clear?

Do you have spark? Ground a plug on the block or use a noid light.

Is the connection to the AFM on tight? Check to make sure the floating sensor plate/door inside moves freely.

Was the battery discharged at any point and you "jumped" the car with another battery, car or used an energy pack booster?

The battery is fully charged by an overnight slow charge?

Here is a PRO short "no start checklist" Some will sound familiar:
Bennington Motorsports

Have you replaced the DME/Fuel pump relay or used the "jumper"

[B]Does the tach bounce when you crank the engine?[B] (sorry but please answer)

On top of the positive battery post, is the smaller red wire that powers the DME computer, clean, not corroded, tight?

If you have tach bounce, Do you have spark at the plugs?

Check the distributer cap, rotor and wires. Check for 12V at the coil with the key ON.

If all else fails---Clarks trouble shooting the engine:
Troubleshooting - Engine

I hope one of these suggestions helps.
John

[porschetub]

Wow John thanks for going to all that effort,I will pick through this list and try the stuff I haven't done,cheers for your help and it sounds like your answer will help a few others @ the moment.