[DML] Re: Fuel Filter Replacement

[Travis Graham <tgraham@xxxxxxxxxxx>]

I just got through replacing my fuel filter (suspected to be clogged  
due to a failed accumulator) and ran into some problems.  I was  
replacing an OEM Bosch filter with another OEM Bosch filter, both of  
which I obtained from a full-service DeLorean vendor (so, it should  
work).

I got the new filter on and the car would not start.  When jumping  
the cold start valve, the car would run, so I know that some fuel was  
getting past, but apparently not enough to get to the main  
injectors.  Before I hooked up the pressure gauge, I noticed that the  
90-degree adapter on the  fuel filter inlet was completely inserted  
into the filter, which was not the case on the old filter (and IIRC,  
not the case on the filter before that).  I took everything apart and  
discovered that when this 90-degree adapter finds its way completely  
into the filter, fuel is choked by the inner bulb of the filter  
canister.

A few photos to illustrate the problem: http://tinyurl.com/l89vy

Another new filter (Bosch OEM) solved my problem and after addressing  
a fuel leak on that pesky rigid line-to-90 degree adapter connection  
(why is that connection always so difficult?!), I'm back on the  
road.  I don't know why the adapter had to be fully inserted on the  
bad filter in order to tighten down.  I did a search to see if anyone  
else had this problem and apparently I'm not alone.  I found Dave's  
post below and another post reporting that there's a Purolator filter  
that solves the inner-bulb problem and works fine.  I guess I can't  
remember posts from 8 years ago.

Bottom line: you have to leave enough space between the adapter and  
the inner bulb in the fuel filter to let the fuel flow, or else your  
car isn't going to run.  I used a couple of wraps of Teflon tape to  
ensure there were no leaks and just kept it away from the edge that  
would be inside the filter.

Travis Graham
#6344


On Wed 2, 1998, at 8:04 PM, David Swingle wrote:

> I replaced my filter with the proper Bosch filter from a recognized
> supplier. Immediately afterwards, the car would not start. After a  
> little
> investigation, I realized that the inlet (maybe the outlet - it has  
> been
> over a year) fitting was bottoming out into the line connection and
> choking off the fuel. Apparently the spec on the depth of the filter
> fitting has changed slightly over the years.
>
> To fix it I cut a four grooves with a hacksaw across the face of the
> fitting on the filter (watch for metal filings). Problem solved. Has
> anyone else run into this?
>
> Dave Swingle





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