Injection fuel pump

[AshG]

you need a swirl pot. to run efi properly. you have a low pressure pump and a high pressure pump.

the 8mm on the tank fills the swirl pot and the swirl pot feeds the 12mm inlet on the high pressure pump

[davidimurray]

Originally Posted by AshG

you need a swirl pot. to run efi properly. you have a low pressure pump and a high pressure pump.

Stricly speaking you don't need a swirl pot if you have a well designed fuel tank. The issue lies with heavy cornering where you can get fuel surge. In carbs the float bowl can often act as a buffer and mask any fuel starvation. When using EFI any loss of fuel supply will lead to the engine stuttering as there is no buffer - a swirl pot is basically an extra buffer added into the system.

If your starting from scratch you can build in lots of baffles, a sump for the pickup and even a gated baffle system around the pickup. Another method you can use on an existing tank is fuel tank foam to prevent the surge although this cannot be used with 'moving arm' type fuel senders.

[alga]

My plan was to have an integrated swirlpot either inside or outside the bottom of the tank in order to avoid the need for the low pressure fuel circuit.

[twinturbo]

If you look inside a sierra injection tank, you will see an integral baffle maze round the pickup to prevent fuel starvation. (well on good tanks anyway).

TT

[davidimurray]

Originally Posted by twinturbo

If you look inside a sierra injection tank, you will see an integral baffle maze round the pickup to prevent fuel starvation. (well on good tanks anyway).

....... and in the filter on a bad one

[baz-r]

the only thing i can think of at the mo is to make sure you have a strainer before the pump as all in tank ones have one fitted at the pump and external ones have one in the tank to catch the bits befor thay trash the pump.

[aerosam]

Originally Posted by twinturbo

Sure the regulator is there for a reason and does a job.

but for example, a pump designed for a K-Jetronic application with mechanical injection is likly to put out 7-8 Bar. Where as the L-Jet based applications (on which the EEC-IV/V is based) is more likly to need arround 3 Bar max.

Best to try an match the pump to a similar application rather than just buying anything. If you have too much flow, and too much pressure then the system won't be able to return the flow.

TT

Sorry to disagree, but I converted a Capri to EEC-IV with and engine and gubbins from a granada (pinto) and used the tank and fuel pump from a 2.8i capri (K-jet) and it ran for 5 years no problems whatsoever. Believe the guy I sold it to still runs it regularly.

[twinturbo]

Originally Posted by aerosam

Sorry to disagree, but I converted a Capri to EEC-IV with and engine and gubbins from a granada (pinto) and used the tank and fuel pump from a 2.8i capri (K-jet) and it ran for 5 years no problems whatsoever. Believe the guy I sold it to still runs it regularly.

I said

"Best to try an match t he pump to a similar application rather than just buying anything"

I did not say it would not work.

And I too have run a 2.9 EFI EEC-IV in an XR4i on it's pump.

As I say "BEST to try and match".

TT