How do you tell if it is the Regina or the Bosch system?
Thanks my intake fuel pump is really whinning and the car is runing poorly.
Sounds like I need to replace.
Thanks!
92 740 Volvo wagon Fuel system questions Topic is solved
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Kmaniac in California USA
- Posts: 301
- Joined: 15 January 2005
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- Location: Concord, California USA
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In case you didn't already know, your car has TWO fuel pumps and TWO fuel filters. The first filter that gasoline passes through is the filter sock on the suction end of the in-tank fuel pump, which is in the fuel tank. Fuel then passes through the in-tank pump, then the main fuel pump under the car below the drivers seat. After that, it passes through the main fuel filter, which is next to the main fuel pump.
Now, the main fuel filter (under the car) is routinely changed at service intervals and this is probably the one you claim was replaced 3 months ago. The function of the main fuel filter is to protect the fuel system components under the hood. The in-tank filter is never looked at and will degrade over time. The function of the in-tank filter is to protect the fuel pumps (both of them) from dirt contamination in the fuel. When (not if) the in-tank filter sock deteriorates, unfiltered fuel will enter both the in-tank pump and main fuel pumps. This first leads to the in-tank pump eventually jamming on the dirt and blowing the in-tank pump fuse, the only indication you will get that the pump has failed. The car will, however, appear to run just fine with a disfunctional in-tank fuel pump. Then the main fuel pump will start to degrade as more unfiltered fuel passes through it. This will cause the pump to inconsistently fail to operate, usually when the car is hot or has been shut off hot. Unfortunately, by the time the main fuel pump eventually fails from dirt intrusion, the owner has either sold or junked the car in frustration from the inconsistent starting.
Now, your probably asking how I know all this. I learned this the hard way when I bought a used Volvo real cheap from someone who was frustrated. It took me three weeks of my own frustration to figure this out on my own. Since I replaced both fuel pumps and in-tank filter sock, my Volvo has run trouble free for over a year.
If you are unsure the condition of your in-tank pump and filter sock, I suggest you pull the sender unit assembly from the tank. This is an easy job for the do-it-yourselfer. Be sure you have less than one-half a tank of fuel. Once you have it out, replace the in-tank pump and filter sock for good measure. You may as well, as long as you have it out. Inspect the condition of the filter sock. If you see any holes in it, then I also suggest you replace the main fuel pump as well, since it is mostly likely dirt contaminated.
One thing I must stress to all Volvo owners is to never replace the main fuel pump without inspecting and/or replacing the in-tank fuel pump and filter sock at the same time. I have read at least one post in this forum about someone who had his main fuel pump replaced three times, at 30-day intervals by an independent (non-Volvo trained) mechanic and couldn't figure out why the new pumps were always defective. The answer: His in-tank filter sock was deteriorated and kept passing dirt to the new main fuel pumps, causing them to fail. I am sure that many a Volvo has been sold or scrapped because of this oversite.
If you read through the posts in this forum, you will see that I harp on this subject quite a bit. I do this because I think this is more common a problem with Volvo's than most people, including experience Volvo mechanics realize. You see, if the basic parts on the back end of the fuel system don't work right, the complicated parts on the front end won't work well either. And most people assume any fuel problem is under the hood and ignore what is in the fuel tank. In fact, most people and mechanics don't realize there is a second fuel pump and filter in the tank.
Keep us posted with what you find out about your car. I always like to hear about success stories.
Now, the main fuel filter (under the car) is routinely changed at service intervals and this is probably the one you claim was replaced 3 months ago. The function of the main fuel filter is to protect the fuel system components under the hood. The in-tank filter is never looked at and will degrade over time. The function of the in-tank filter is to protect the fuel pumps (both of them) from dirt contamination in the fuel. When (not if) the in-tank filter sock deteriorates, unfiltered fuel will enter both the in-tank pump and main fuel pumps. This first leads to the in-tank pump eventually jamming on the dirt and blowing the in-tank pump fuse, the only indication you will get that the pump has failed. The car will, however, appear to run just fine with a disfunctional in-tank fuel pump. Then the main fuel pump will start to degrade as more unfiltered fuel passes through it. This will cause the pump to inconsistently fail to operate, usually when the car is hot or has been shut off hot. Unfortunately, by the time the main fuel pump eventually fails from dirt intrusion, the owner has either sold or junked the car in frustration from the inconsistent starting.
Now, your probably asking how I know all this. I learned this the hard way when I bought a used Volvo real cheap from someone who was frustrated. It took me three weeks of my own frustration to figure this out on my own. Since I replaced both fuel pumps and in-tank filter sock, my Volvo has run trouble free for over a year.
If you are unsure the condition of your in-tank pump and filter sock, I suggest you pull the sender unit assembly from the tank. This is an easy job for the do-it-yourselfer. Be sure you have less than one-half a tank of fuel. Once you have it out, replace the in-tank pump and filter sock for good measure. You may as well, as long as you have it out. Inspect the condition of the filter sock. If you see any holes in it, then I also suggest you replace the main fuel pump as well, since it is mostly likely dirt contaminated.
One thing I must stress to all Volvo owners is to never replace the main fuel pump without inspecting and/or replacing the in-tank fuel pump and filter sock at the same time. I have read at least one post in this forum about someone who had his main fuel pump replaced three times, at 30-day intervals by an independent (non-Volvo trained) mechanic and couldn't figure out why the new pumps were always defective. The answer: His in-tank filter sock was deteriorated and kept passing dirt to the new main fuel pumps, causing them to fail. I am sure that many a Volvo has been sold or scrapped because of this oversite.
If you read through the posts in this forum, you will see that I harp on this subject quite a bit. I do this because I think this is more common a problem with Volvo's than most people, including experience Volvo mechanics realize. You see, if the basic parts on the back end of the fuel system don't work right, the complicated parts on the front end won't work well either. And most people assume any fuel problem is under the hood and ignore what is in the fuel tank. In fact, most people and mechanics don't realize there is a second fuel pump and filter in the tank.
Keep us posted with what you find out about your car. I always like to hear about success stories.
Chris the "K MANIAC"
1986 740 GLE
(5) 1964 Chrysler 300-K's
1986 740 GLE
(5) 1964 Chrysler 300-K's
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