Electric fuel pump

DanC

DanC

New Member
Been having trouble with fuel pump so l am going to put an electric one in. Just want to check if I'm on the right track. I will need a solid state fuel pump. A fuel pressure regulator and an inertia shut off switch. I was wondering if it would be OK to leave machanical pump where it is and keep it connected
Cheers
Dan
 
Hi Dan.
It would be best to remove the pump and blank off the hole in the block. You could even remove the operating arm on the pump and re-fit the pump body, but I would by-pass it as you could end up with fuel in the sump if the diaphragm splits.
Spot on with the inertia cut out switch but if you get pump that delivers a low enough pressure then you shouldn't need a regulator. The carb needs about 1 1/2 to 2 psi to work so if you can find one there or there abouts you should be fine.
 
Thanks for that. I thought it was 3psi that I saw on a thread. I've got a su carb fitted if that makes a difference. Think I'll probably remove the arm as I don't know where I'd start blanking it of. I will bypass it though. I cheers
Dan
 
3psi would OK but some run at 6psi, I wouldn't go there without a regulator
 
Just checked the workshop manual and the mechanical pump runs between 2.75 psi and 4.25 psi so I was a but light on my estimation. Those figures are where you should aim for.
 
SU’s need low pressure apparently 2-3 psi in my reasearch, run mine 2.5 on SU with a regulator without issue and that’s on a very mildly tuned engine not sure what 4would do but probably ok I guess
 
I've got pump and safety switch so going to have a go today. what would you recommend I wire it to
Cheers
Dan
 
See if there's a spare ignition live on the fuse box. If not then a piggy back spade connector to split an existing feed from the fuse box should do the trick - it could be taken from the unfused side of the box if you include an in-line fuse holder.
 
Cheers yes am putting an in line fuse in. There are 2 fuse in fuse box not much room so will split. If psi to high what will happen
 
The pressure could overcome the float valve in the carb and over fuel/ over flow.
 
Cheers there was a spare on the fuse box all went in great and pump working well but engine not firing at all I assume it must be electrical now. maybe I've dislodged something. such is life
Cheers for all advice
 
When I was messing about behind the dash I discovered some of the collectors were so loose it was probably spider webs or gravity keeping them connected lol
 
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