When I drive my 88 volvo 740 gle my car will suddenly become very weak and won't go over 30mph and starts missing really bad. I can press the gas pedal to the floor and it just gets worse. Some days if If I baby it, it will do just fine. When it starts acting up, the fuel pump is very loud. I have a new main fuel pump on the care and just recently replaced the fuel pressure regulator. Any ideas?
Have you tried replacing the fuel filter? It is located under the cars center on the left side ..
You will find it alongside the main high pressure fuel pump on a metal
support plate held up with 3 bolts.
Remove the 3 bolts with a 10mm
socket wrench to lower the plate. Place a catch pan below the filter to
catch any leaking fuel.
Be careful not to get fuel in you eyes or
running down your arms. Remove the 2 bolts holding the banjo fuel pipe
connections to the filter.
Note the direction of the filter.
Loosen the
clamp holding the filter to the support plate and slide out the old
filter.
Install the new filter in the same direction as the old one and
use new copper sealing washers on the banjo connections.
I had the same problem. Our Volvos have two fuel pumps, one pump failed. I could only go 25 mph. I replaced the fule pump inside the t fule tank, now it works fine. If you have a way to test the fuel pressure do it. It may tell you if it's the pamp.
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