Here's a inexpensive fix from a FBBO member. I bet it works well.
Hi Guys, I realise this is an old thread, but I thought Id let you know how I solved the fuel evaporation problem which as most of you know is the only problem Ive ever encountered with using Edelbrock Performer or the AVS800 I have on my R/T440. i presently own 3 x cars with Edelbrock carbs and this mod Ive done on 2 of them because the latest conversion I did on my 1990 Camaro from TBI to Carb didn't require priming because Im using the existing electric In-tank pump with a return regulator, so no need on that one. On both my 85 Z28 and my 67 Dodge Coronet R/T440 Ive fitted a Marine Dept approved 3/8" Mercruiser Fuel Priming Bulb fitted for easy access just prior to my Mechanical Fuel Lift Pump on both cars. Also I have fitted 0-15psi Liquid Filled pressure gauges between the Lift Pump and the Carbs. These conversions have been on the cars now since 2011 and have worked perfectly. The standard procedure I use on my cars before starting is to lift the hood, do a visual check all over for leaks anywhere, check the drive belts... and all fluid levels. Then I simply lean down and squeeze the Primer Bulb maybe 3-4 times until I see 5 psi on the gauge then I stop pumping all the while watching the gauge... if the gauge maintains that 5psi or drops to maybe 4psi, then you know the bowl(s) are full and ready. If once you stop priming the pressure on the gauge drops away you know its still not full and you can gently continue squeezing until the gauge holds steady at 5psi. Caution, yes theres always a caution... experience has taught me that simply squeezing merrily away until a positive/solid resistance is felt on the primer bulb.... will actually overpower the float needle and flood the bowl(s) these primer bulbs are very efficient at transferring liquids so a gentle touch is all thats required. In saying all the above, Ive only ever had to prime the system either if the car has been sitting for more than 1-2 days after a hot run especially during Summertime runs... or after sitting unused for an extended period like during the Winter months. Another important benefit of having such a mod is Instant Starting everytime... your Starter Motor and Battery will love you for it
View attachment 1715681381
