Fuel vapourisation... A problem when new?!

#61
My V8 vapour locks in hot standing traffic. It has an electric fuel pump under the bonnet, electronic ignition, a new radiator. The only thing I haven't done is replace and/or reroute the fuel line that runs between the carbs. Quite why they run it down and across a hot inlet manifold is a mystery.
 

rockdemon

Administrator
Staff member
#63
Are you sure it vapour locks and that the pump isnt overwhelming the carbs and dumping petrol causing it to cut out?

I have the Huco pump but had to add a regulator in order to prevent the carb being overwhelmed when standing in traffic for long periods... Some people get away without a regulator but i wasnt that lucky. The fuel delivery is spiky it seems.
 
#64
I suffer from the same issue. Only stalls when in long queues. Remove air filter elbows and put fuel into carbs it boils immediately. Heat is all at top of engine/inlet manifold allowing the carbs to get too hot. I have yet to fit an electric pump to see if this help, but I am looking to find away to get the heat out of the top of the engine bay. This as far as I can see will stop the fuel boiling in the carbs. This has caught me out 3 times now the first time when it stopped when I was stuck in traffic bringing it home when I bought it the second waiting to get into Enfield Pageant and the third waiting in queue to get into Uxbridge show. This Is why I am trying to get hazard lights to work!!!
 
#66
I fitted a cylindrical facet pump to the rear of the car NADA style and never had a single vaporisation issue afterwards, even on some 35 degree days!

Prior to this it would usually catch me out in heavy traffic or after stopping the car for a short period in hot weather, like when you are filling up. A couple of times it died just before I pulled onto the A316, a few hundred metres after pulling out of the petrol station... if i had made it a bit further before it conked out it would have been a nightmare!
 

sdibbers

Well-Known Member
#67
The NADA cars have koozies around the float chambers (HS6 carbs IIRC?) Joe Curto sells modern versions on his website Float Bowl Koozies - JOE CURTO, INC.

I had a similar problem with the HIF6s on my 2200TC over here in hot weather and had to add extra heat proofing. Not sure how far you can go with HIF6s on a 3500 though.
 
#68
I have an electric fuel pump on my V8, and electronic ignition too. I still get vapour lock in hot traffic. The float bowl koozies look like a good idea, but I dread to think how much they'd cost to send to the UK. I've seen similar material for use on fuel lines too. Time to play under the bonnet again I think!
 

cobraboy

Well-Known Member
#71
I think I would get a hold of some sheet thermal wrap and make my own, if I had a vapour lock problem, which I don't. I never did when on the HIF6 and don't with the HS8 and the float bowls on the HS8 touch the rocker covers !
Could be that the fuel is going through so fast it aint got time to get hot :D
 

harveyp6

Well-Known Member
#72
I suffer from the same issue. Only stalls when in long queues. Remove air filter elbows and put fuel into carbs it boils immediately. Heat is all at top of engine/inlet manifold allowing the carbs to get too hot. I have yet to fit an electric pump to see if this help, but I am looking to find away to get the heat out of the top of the engine bay. This as far as I can see will stop the fuel boiling in the carbs. This has caught me out 3 times now the first time when it stopped when I was stuck in traffic bringing it home when I bought it the second waiting to get into Enfield Pageant and the third waiting in queue to get into Uxbridge show. This Is why I am trying to get hazard lights to work!!!
I have an electric fuel pump on my V8, and electronic ignition too. I still get vapour lock in hot traffic. The float bowl koozies look like a good idea, but I dread to think how much they'd cost to send to the UK. I've seen similar material for use on fuel lines too. Time to play under the bonnet again I think!

Are you both still suffering with this problem?
 
#73
Are you both still suffering with this problem?
Harvey yes still suffering. I have now bought a 74 degree thermostat to try and see if that makes any difference. Just need to find time to fit it. I have also noticed very slight play in water pump bearing. So will change that too. Can only try these things.
 
Top