Re: electrical problems relating to fuel pump

[joelpash@xxxx]

Placing the jumper between the two wires causes the fuel pump to 
run. The car will still not start however when this jumper is 
connected. I replaced the main fuel relay and that is not the 
problem either because the car will still not start. There is a 
white and purple wire that goes from the fuel pump to the RPM relay 
and this is only showing about 4 volts with a volt meter when tested 
between the connection to the RPM relay and the stainless steel on 
the car. When I try to start the car it moves up to about 6-7 
volts. I am not sure what the significance of this is because I 
think it should only be 12 volts if the relay closes, but it is just 
an observation. This did lead me to think however that it is 
possible that the wire betwen the relay and the fuel pump is 
damaged. Evidence supporting this theory would be that it was the 
only wire I touched when I changed the fuel pump (because I needed to 
disconnect it.) What doesn't make sense however is that the car 
started without me touching that wire, and then subsequently died. 
But it only did this once.

I am thinking about getting an OHM meter and testing the white/purple 
wire. What else should I look at now?

Thanks again.


--- In dmcnews@xxxxxxxxxxx, "DMC Joe" <dmcjoe@xxxx> wrote:
> Joel,
> 
> First; replace all of the fuses with the specified rating per the 
workshop and owners manual.
> I suspect that you have replaced the fuel pump fuse # 7 with an in-
line type replacement. It is also probable that the previous owner 
has done some re-wiring in the fuel pump circuit.
> 
> You can easily temporarily by-pass the RPM relay and force the fuel 
pump to run by placing a suitable jumper between the brown and 
white/purple wires at the RPM relay connector. The relay does not 
have to be installed to conduct this test. 
> 
> Try this test and let me know the result. 
> 
> "We're here to help you"
> 
> DMC Help / De Lorean Services / <dmchelp@xxxx>
> Web Site: <www.deloreanservices.com>