Club Night Forum – Failures and

Club Night Forum – Failures and How to Avoid Them

Part 7 - FUEL

Click here for Part 4 - Suspension, Steering and Brakes

Click here for Part 5 - Electrical and Ignition

FUEL SYSTEM
Won’t Start After Standing
·         Fuel stale – change
·         Fill float bowl with fresh fuel
Corroded Tanks
·         Cut out offending section and replace – danger! - only for people who know what
·         they are doing! Exhaust gas from non catalyst car can kill old fumes in petrol tank
·         Ethanol attacks tank sealer – see FBHVC.website Ethanol could be good reason to
·         leave EU !!
·         Use gravel to clean tank when out of car - shake it !
Car Stops or Runs Poorly
·         Worn lever on pump
·         Wrong size jets
·         Blocked jets
·         Use fuel filter - glass better as paper restricts flow on gravity feed. David Cochrane does filter for 22FZ inlet
·         Get you home cure - blow back to tank with airline
·         Remove tank and clean out
·         No Fuel
·         Tank tube broken !
·         Tap not turned on !
·         Dome bolt stripped on pump - get home with ratchet straps
·         Vapourising
·         Tie bonnet back on mountain !
·         Provide heat shield
·         Wrap down pipe in heat resistant tape or cord
Flooding
·         Hole in float due to ethanol – carry spare
·         Float height critical on SU
·         Bowl loose on sidedraught – use lockwashers on bolts
·         Worn needle and butterfly weights on updraught carb – renew and polish collar
·         and new weights to ensure smooth movement. Big improvement in fuel economy!

What benefits are gained by switching the Zenith carburettor to an SU? the SU gives a bit more power and smoother running. 1⅛” is generally accepted as the best option for a standard road car. Sports and racing Sevens sometimes use a 1¼” SU carburettor.