Fuel Pumps and Walbro oh and heater stuff too

[Shaheenk]

Hi Guys

so 2 stages to this question, which I am sure Brian will answer. Thanks in Advance.

1. I have a 323i Chromie , it is now 30 years old, the fuel pump died a few weeks ago , but I am not sure if the external or the internal gave up the ghost, all I know is while cruising along on the motorway I had no power and had ti pull over. I pulled the pipes from the fuel rail and it was bone dry. Towed the car home and when I got home tried to start it again and it started .

I have since changed the external unit , but what are the chances the internal one is the faulty unit ? Since this car runs a 2 stage pump can I replace the internal with one of these high flow 225lb Wlabro units , yes/No. Car has a 55liter tank.


2. The car went to the "mech" to have the motor rebuilt , I also supplied a new heater core as the old one was fubar, the car has come back but the heater was not getting hot, in fact it got semi warm if that. With Winter on it's way I decided to inspect the work. Seems the pipes from the head and the engine were the wrong way around on the stubs, head went to the top and engine to the bottom.

I removed these to swap them around but found that the one from the head had no coolant in it while the one from the block dribbled out a bit of coolant, not a whole lot.

Have I dont this right and how else can I check the operation ?

[Brianmoooore]

No expert on this very early stuff, but AFAIK both pumps can be replaced by a single in tank pump, with appropriate minor mods. to the plumbing and wiring, as long as the tank has the cup welded to the bottom for the pump pick up filter to sit in.
Are you sure you actually have two pumps? Not all external pumps used an internal 'lift' pump as well. The electrical connectors will tell you - there will be a two pin plug for the pump plus a three pin for the level sensor on top of the tank if you have two pumps.
Absolutely no advantage in going for any kind of 'high flow' pump. The standard pump is more than adequate by a considerable margin.
Another garage to cross off your list! Total incompetence for a 'professional' to get the pipes the wrong way around.
The coolant is there in the pipes, but you are almost level with the coolant tank, so there's no pressure to make it flow.
Filling the coolant bottle to the brim helps, and if that's not enough there's a trick that can be done with facelift M20s, which I think can be applied to pre facelift as well.
Do you have an overflow hose on the coolant bottle? If so, remove the pressure cap, put the end of the overflow house in your mouth, put a hand flat across the neck of the bottle to block it off, then blow gently into the hose. Water will flow from the hoses. push the head hose on the bottom stub, block the second hose with a finger, blow until water comes out of the top stub free of air, then push the top hose on while the coolant is flowing. Perfectly bled heater system and no airlocks!

[Shaheenk]

THansk B , I do indeed have 2 connectors on the tank, 3 pin and 2 pin.

I will investigate options for the in tank unit.

Shaheen