78 Seville Fuel Pump

[Slicktyrone]

So I bought a 78 Seville at an auction that was not running. Realized the original tank was missing along with fuel pump assembly. I ended up ordering a tank from Amazon with pump and assembly ready to go out of box. It took some fuel hose rerouting but I got it to fit in snug. The problem Im having though is that the wires to the Fuel pump have low voltage, 6-7 volts.

SIDE NOTE! I understand there is supposed to be a chassis mounted pump as well but Im trying to make it work with the 1 modern pump I ordered in tank. The previous owner had the chassis mounted pump rigged straight from the fuse box which made it run continuously. New Battery installed and to make sure pump actually worked, I borrowed that rigged up fuse box wire from previous owner and connected it to new pump. Car runs no problem.

Temi Eniola

[bcroe]

Some of these cars got the pump supply reconnected to
ignition when the weak ECU control burned out.  This
is an safety hazard, if the ignition were on with the
engine not running (accident or service work), a fault
in the fuel line could empty out the entire tank of gas
into the fault.  I have worked out repairs to the ECU,
and supply a Fuel Pump Relay Kit that prevents a repeat
of the original problem. The jerry rigged wiring is
no doubt responsible for the low voltage. 

Your in tank pump must deliver about 39psi fuel pressure
when you just turn on the key, with enough capacity
for around 200 hp.  Check pressure at the fuel rail. 
There was also a chassis fuel filter to protect your
injectors.

So common, car bought in non running condition because
the early analog EFI was not understood.  Several owners
here have been supplying parts and information to fix
them.  I should check your ECU (which probably needs
repair) to get that off your list of problems.  Have
been taking care of my 79 with the same EFI for 27 years. 

I will email you a lot of info on the car EFI if you
will email me.  bcroe AT SIGN  juno DOT com
Bruce Roe CLC # 14630