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Fuel guage Problem

dave993cars

dave993cars

New member
Hi Folks

My C4S has been in storage for three years (ran on a regular basis) went for it's MOT yesterday, passed no problem, taxed the car and went for a quick run last night, when I filled the car with fuel I noticed the guage was only showing 3/4 full, by the time I was home (20 miles) the guage was now showing empty, I had a quick look at my bible (Porsche 993 The Essential Companion) and it says the fuel sender is faulty, but before I buy a sender I wondered if there could be a simple reason for the problem that someone here has had experienced, also if it is the sender is it best to purchase from OPC, many thanks.


Dave S
 
Given how the sender works (it's just a float that bobs up and down on the surface of the fuel connected to a electrical switch that measures where the float is) - I'd have thought it might have got a bit stuck with the car now being moved much in 3 years. I'd be tempted to drive around some more (perhaps over some pot holes!) to see it it naturally comes back to life before going to trouble of changing it.
 

ORIGINAL: Mark Elder

Given how the sender works (it's just a float that bobs up and down on the surface of the fuel connected to a electrical switch that measures where the float is) - I'd have thought it might have got a bit stuck with the car now being moved much in 3 years. I'd be tempted to drive around some more (perhaps over some pot holes!) to see it it naturally comes back to life before going to trouble of changing it.
Click to expand...

Of course you will have to take the pot hole suggestion with a large pinch of salt [;)]
 
I had a similar problem on another car not the 993. turned out the float had developed a small hole allowing fuel to get inside.
 
The 993 fuel level system is a development of the 964 one where the electronics are moved to the gauge(I was led to understand) as the original 964 tank unit -that long cylinder which included electronics--was upgraded to just a level unit -now with a 993 Pt no- but still a long cylinder but with an add-on electronic module which fitted on top of the cylinder with appropriate connectors.This was then omitted from the 993 as above.
I would suggest initially checking all the connections -it's also very easy to remove the level cylinder to check it .
 
Hi Folks

Thanks for the replies, I tried as Mark suggested and did over 150 miles in the car but to no avail, I also checked the electrical connections as Vitesse pointed out, but still the fuel guage was showing empty, I have now ordered a fuel sender from V-Zweeden and expect it any day now, I will post when I have changed the unit over, many thanks.

Dave S
 
Hi Folks

Been away working on Skye, sender unit arrived and fitted, problem solved, I have looked at my old unit but I can't see any signs as to why it has failed, all OK.

Regards

Dave S.
 
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