nova2015

iTrader: (5)

This engine is in an RS4 Drift, trying to get it sorted for a mate;

Car is new, currently on run-in, has had 5 tanks put through. However will not run properly unless pressure line is disconnected from fuel tank. Removed, it will idle and run just fine. When fitted to tank, rpm's slowly increase until engine stalls around 30 seconds later. Remove line, starts and runs fine again.
Needles are at factory settings, plug is LRP medium, fuel is Nitro X 20%, with 15% oil (5% castor 10% synthetic).

Have already checked and eliminated fuel tank and lines, glow plug and fuel. Have also checked tension on head bolts and backplate bolts.

Suggestions?

Roelof

Blow on the pressureline in both ways to see if it is blocked. Due the small diameter it is normal to have some resistance.
Also check if the pressure line itself is not knacked so it will block the backpressure.

And not sure what your experience is but the pressure line is your fuel pump. taking it away takes away the pump what causes a leaner setting. Because these new engines do come with a rich setting for the 1st start and break in you have to adjust it to a more lean setting during the break in proces