[DML] Re: Need some insight or guidance for locating problem

["DMC Joe" <DMCJOE@xxxx>]

Lets determine weather or not you are losing power to the fuel pump while
you are driving. Set up the following test:
Access the fuel pump and run a test wire from the positive post through the
hole in the firewall where the hood release cable goes through. Once inside
the car hook your 12v test light between the test lead from the pump and
ground. To be sure that the problem is not ground related jump the inertia
switch during this test.

Let me know your results.

DMC Joe / DeLorean Services / <dmcjoe@xxxx>
Web Site: <http://www.deloreanservices.com>

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> From: dstall@xxxx
> 
> Earlier I posted a note about State Farm insurance and also a problem
> about my DMC-12 automatic lugging down as if there was a fuel problem.
> The problem: I'm driving along and the car slows down as though it is
> running out of gas; if you turn off the key and then turn it on again
> the car accelerates back to the speed it was running at and all is well
> for about 2-4 minutes and then it repeats the slowdown again; turn off
> key and turn on and its ok for a short time again.
> 
> What I've done. Replaced fuel pump relay; replaced fuel pump, gas
> pickup line and filter on fuel pump inlet. 
> Diagnostic setup: 
> 1. put tap into fuel line at fuel inlet on fuel distributor with
> pressure gage 2. put 12 v light on power line going to fuel pump in
> fuel pump relay with other end of light grounded. 
> Observations:
> 1. The fuel pressure is at 75-80 psi while engine is running and about
> 45-50 psi at rest. 
> 2. Light is off until car turns over to start and then it stays on and
> doesn't go off when car slows or until key is turned off to quit
> 3. fuel pressure doesn't waver at all while car is running or slowing
> down. 
> 4. car has good acceleration and power except when it slow as if fuel
> is starving; also I hear something that sound like preignition knock on
> occassion when it is slowing down with throttle depressed. 
> 
> I'd like thoughts on what to check out next. Insight or suggestions
> will be really appreciated.
> 
> DaveS
> dstall@xxxx