Electric fuel pump install questions

bergxu

Member
Gents,

I know has been covered ad nauseam and I’ve done a fair bit of reading on the subject but was wondering if anyone has used the electric fuel pump kit from Wins as here;
Fuel pump kit

Finally got my P6 out last week and despite it being a fairly cool evening, I was left stranded with a case of vapor lock as I’d had the car idling for extended periods whilst going through some gearbox level checks, road tests, etc…I recalled this happened to me pretty much the last time I drove the car for any extended period with lots of idle time so time to sort that out. What I’m trying to decide is if I should eliminate the [freshly overhauled] mechanical pump and just go electric or if I should leave the mechanical pump as the primary and just use the electric pump in emergency situations. Presume neither pump is a flow-through design so would need to use the reserve fuel line to feed the electric pump unless I just do away with the mechanical one altogether?

The kit Wins have does come with a blanking plate and I’m certainly not averse to relegating the mechanical pump to the spares shelf if the concensus says the electric pump takes care of the vapor lock issue, although what’s slightly of concern is that I also sometimes deal with this issue on my 1948 MG TC which has the original electric SU pump mounted on the bulkhead of the engine room and on hot days, the car will definitely quit running unless there’s a constant stream of airflow across the pump, so some guys have fitted secondary pumps back by the fuel tank in a ‘pusher’ configuration.

Obviously, just want to do what’s most simple and effective. I don’t drive the P6 often at all but when I do use it, I’d like to know I won’t have to spend an hour roadside setting bags of ice on the fuel pump!

Thanks all for any info!
 
The tips for avoiding vapour lock are as follows. Make sure the tower on the intake between the carbs has a free flowing coolant outlet to the top of the radiator.
Make sure the fuel supply pipe connecting the two carbs is not routed low down, or even laying on the hot intake manifold.
Make sure the rest of the fuel supply pipework is away from anything hot, insulate it if it is.

You could try all of the above before shelling out on a new pump that still may not provide 100% satisfaction.

I ran SU HIF6 carbs fed with a stock mechanical pump without any issues taking into account the above measures.
 
The tips for avoiding vapour lock are as follows. Make sure the tower on the intake between the carbs has a free flowing coolant outlet to the top of the radiator.
Make sure the fuel supply pipe connecting the two carbs is not routed low down, or even laying on the hot intake manifold.
Make sure the rest of the fuel supply pipework is away from anything hot, insulate it if it is.

You could try all of the above before shelling out on a new pump that still may not provide 100% satisfaction.

I ran SU HIF6 carbs fed with a stock mechanical pump without any issues taking into account the above measures.

Thank you for those tips. I’m in the US where temps are typically a fair bit higher than those in the UK (although maybe this past summer speaks otherwise!). What’s an effective heat shield to use to wrap around the rubber fuel hose(s) between the mechanical pump and filter and the carbs?
 
Being in Oz we have somehigher temps than UK...so while I worked on the mechanical pump once I fitted some left over heat sleeving (similar to that Harvey pointed to) on the input pipe to the pump all the way back over the bellhousing ,nearly to the reserve tap. Protects the pipe from exhaust manifold heat somewhat. Being on the low pressure side of the pump, fuel there will be more prone to vapourize than on the output pressure side. Later I fitted a Huco pump as low as possible behind the near side headlights - very simple to power it from the windscreen washer pump supply.
 
As I needed some other bits to freshen the cooling system (hoses, etc..) I went ahead and added the pump kit to my order and will get some sleeving on the way as well. Certainly would like to know I can use the car in 80 degree + temps without worrying about it quitting when I get caught at the inevitable long red light. Appreciate the thoughts, gents.
 
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