Re: Fuel pump issues...
<DerrelCopeland@gmail.com> wrote in message
>I have a 1990 240DL that has sat for a couple years. The gas turned to
> varnish so I had the tank cleaned, bought new fuel pumps, sending unit,
> gas cap and a few other small items to complete the repairs.
> My problem is that I'm not getting voltage (current) to the pumps. I
> replaced the replay a few years back and it clicks when the key it
> turned to position II. I also have an extra LH-Jet computer. The car
> has ran in the past before any of the repairs were done, and nothing
> has changed other than it sitting for so long.
> I need ideas as to what to check. I've read a lot of posts here and
> tried most of the things that applied, but haven't found a solution.
> Any help is greatly appreciated.
> Fossil Rock
The relay can click and still not supply power. The typical problem is
cracks in the solder connections on the circuit board inside. If you have
good eyes and good light the cracks are visible as dark hairlines around the
solder meniscus on the leads of components, especially the heavier ones.
I don't know what sort of fuses your '90 has, but if it has the round fuses
you probably should take them out and buff up the contact surfaces on the
fuses and holders with Scotchbrite or similar. Also check over the
connections at the battery cable - in 700 series cars a few have had a wire
corrode completely in two and cause the fuel pump not to get power (although
the fuel pump relay doesn't cllick under those conditions). Still, worth a