Over the past two months I have encountered what I assume is fuel surge about 6 times on my STi7, which has an uprated fuel pump. The symptoms are loss of power for a second or two when accelerating. It has occured on the road whilst accelerating out of a roundabout, accelerating after a 50 mph corner and once in a straight line after lifting and reapplying the gas to go around a cyclist. Every time it has happened the fuel tank was between 1/3 and 1/8 full.

Can occasional fuel surge like this damage the engine?

Alan

 

Yes it could damage. The only times I got fuel surge were at the knockhill hairpin and in a straight line only once the fuel light is on and with >300lbft or when I had incorrectly fitted the short filter sock supplied with the fuel pump originally. I wonder if the latter could be your problem?

 

<Waits quietly for the first comment>

 

Do you know something about fuel surge then Kenny

 

It can damage your heat shield (AKA flame suit) pretty badly apparently

 

John

Thanks for the reply and suggestion.

So in your opinion occassionally running lean for 1-2 seconds due to fuel starvation is sufficient to significantly damage an engine?

How tolerant are of Scoob engines to transient lean AFRs? Can a few seconds of lean running cause them to "blow up" ?

Alan

 

Lemmy I've asked the same question a few times and never really got an answer. What concerns me in particular is that at some point, albeit briefly, my car is exposed to 1.2 bar of boost being pushed through an engine that has a spark but no fuel. Nobody really knows how bad that is but logic dictates that it can't be good

 

Think it would take more than that judging from the number of times mine did it at Knockhill last year and it sounds/feels awful when it happens.