Is the correct hose clamp size 13mm ? I'm replacing all the fuel hoses in the engine compartment...

"Ideal brand' hose clamp sold at pepboys part number 52F15V is the correct size 9range 13 to 15 mm this fits just fine on the engine bay hoses.

be sure to upgrade your hoses to the newest SAE 30R9 standard this will be marked on the hose) the older FI hoses are not resistant to the mandated crap gas filled with oxygenates. the older rubber hoses will be attacked. the 30R9 hose is lined with a Teflon like material that resists the attack of the new gasolines manadated by the politicans.

if the hose is not marked SAE 30R9 along its length, it is likely NOT the right stuff to use. ask for it specifically at you auro parts store, not the old standard 30R7 used to be ok for FI system, recent production is now being marked as Unsuitable for Fi systems, part o fthe new world of mandated gas formulations. note note all auto stores may be aware of teh differenace and they may tryt o sell you lesser hose as OK for FI, do Not do that, get only SAE 30R9 hose. Note it is only locally available in english sizes. the 5/16 inch is a good fit for the engine bay hoses.

so get a spool of 5/16 inch 30R9 hose to go with your Ideal 52F15v hose clamps

have fun,