I've a 'different' setup now so that there is no metering head and no hot unused fuel being returned the tank..... yet today after over an hour in crawling traffic, I could hear the fuel pump buzzing louder. I pulled over and opened the fuel cap and the hiss/vapour release helped (as well as a fresh top up of nice cold fuel).
I'm sure that this never used to happen years ago to the extent it has been more recently (i.e. the same as when it was stock compared to eliminating the return of hot fuel), but on days crawling in traffic for over an hour I still ultimately hear the fuel pump buzz louder and despite the measures taken below I'm still having the following issues:
So far I've:-
- new pickup hose
- changed the rollover valve, for why see third paragaph of http://support.delorean.com/kb/a42/fuel-smells.aspx
- coiled tig wire in the new pickup hose to stop it collapsing
- new, higher powered Bosch fuel pump
What I've not changed
fuel gauze on the end of the pickup hose as it seems okay, looks clean with no visible debris in the gauze, but maybe it is partially blocked and only noticeable when the tank is hotter?
What else is there?
- neoprene around the coolant pipes that run under the tank
- neoprene dam to help insulate it from hot air from the radiator
To be clear, the cooling system is running perfectly, this is purely hot tank scenario and when the noisy pump can't handle or take the amount of fuel needed, bunny hopping, stuttering and the car cutting out are what you're faced with until the tank/fuel have cooled down.
Any thoughts/suggestions are welcome. For those of you that sit and crawl on the freeway in the hotter states like Texas etc surely must have found how to solve this?