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1、FuelproblemsFuelstarvation:ThisisusuallyputdowntoevaporationintheAutovacduetoitsproximitytotheexhaustmanifold.ThismaybethecasewiththeP1butisunusualonthe20hp.Itisusuallyabuildupofsolidfuelvarnishononeofthepetrolfilters.Noamountofwashingwithpetrolorsolventswillremovethisvarnish.Whatmayhap

2、penisthevarnishblisters,asthefilterheatsup,andclosesoffthegapsbetweenthedisks,whichwereonly0.002"wideoriginally.Theansweristodismantlethedisksandsoaktheminlemonjuicefor24hours.Thisdissolvestheresiduewithoutdamagingthemetaldisks.(Zenithfilteronfirewallbehindsteeringcolumn.post1928),Check

3、theAutovacandpipingforanyairleaksandforcleanlinessofmeshfilters.Filterscanbelocatedatcarbinlet(pre1928),infuellineatAutovacconnection(conemesh),inthepickup(tubularmesh)inthefueltank(2ndfilteronreservepickupfrom1928).Post1926,thetickovervalveattheAutovacmayalsobecomeblockedwithfinecarbon

4、andstickopenorclosedAsuddenchangetorichrunningcanbecausedbyseveralweirdoccurrencesontheseengines.Asastart,makesurethatthesteeringwheelmixtureleverwasnotlefton'strong'.Checkthefloatchamberforleakagecausedbythefloatinletvalvestickingorjammed.StickingVacuumvalveintheAutovacwillalsocauseari

5、chmixtureaspetrolcouldbesuckeddirectintoinletmanifold.Checkthefollowing:-1)thatthechoke(cold-startcarburettor)hasnotbeenturnedonordisconnected.2)thatthefloatchamberinletvalveandmakesurethatitisnotstickingorjammedwithapieceofgrit/dirt.Unscrewupto1927–post1927,flickoffthelockingcatchandun

6、screwthelidofthechamber.Whileyouareinthereitisworthcheckingthefloatsetting-seehandbook.Petrollevelcanbecheckedthrusightglass(upto1927.3)itdependsontheChassisSeriesforthefollowing.Earliercarsdidnothaveanairfilter;justaninlettractwithafinegauzefilterinside.Ifoftheearliertype,checkthatthef

7、ilteristhereand,ifso,makesurethatitisnotblocked.Ifoflaterbarreltype,checkthattheairinletiscleanandnotblockedwithawaspnestetc.4)Unscrewthejetassemblyfromthetopofthecarb.(thebigknurledcylinderonthetopofthecarb).Wipethevalveandventuricleanwithalint-freeclothsoakedinpetrolorparaffi