Question about 1994 Volvo 850
Based on your observation of the timing of the problem, the first suspect is water in the bottom of the tank being stirred up when you add fuel. Buy a bottle of HEET and put it in to see if it makes any difference. I am betting it will.
Posted on Apr 10, 2011
Testimonial: "Thanks!!! I added a bottle of HEET to a low tank. I drove about five miles and added another bottle at the gas station. It started fine. Thanks again"
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Posted on Jan 02, 2017
First off, what kind of vehicle do you have? I assume it is one that has an electric fuel pump in the gas tank, so that is what my answer will be geared to.
On the gas tank there are several lines. The most important ones for this conversation are the ones that deliver fuel to the engine and the one that returns the excess fuel back to the tank. They are usually different in size.
The larger one delivers the fuel and the smaller one returns the excess fuel back to the tank. Either one may be the culprit in this scenero.The tank is usually connected by a high pressure flexible fuel line to a stainless fuel line resembeling a brake line. At times this flex line may develope a leak for varrious reasons. It could be something rubbing against the line, it could be the crimped connection went bad and is leaking, etc. If it is your flex line, which it probably is there is a repair kit you can purchase to fix it. I have only been able to find this repair kit at NAPA. I've tried many auto parts stores and they are the only ones that carry it. The use of it is very simple actually. You find the leak in your line, which by the way is harder than it sounds and usually involves removing the gas tank. In which case you will need a special tool to disasemble the gas line from the tank. Once the leak is located you cut the line. You then have to place the remaining flex hose in boiling hot water for at least 10 seconds, which makes it soft and insert a splice fiting into it. When the line cools, it will shrink tight on the connector. You the do the same with the hose that came with the repair kit. Then do the same with the other end and install the fitting which connects to the gas tank. You should now be in business.
BTW. I have to do this very thing tomorrow.
Good Luck! and let me know if this helps you.
Posted on Mar 07, 2009
If the fuel gauge drops off when you are driving then its a sending unit problem that means you have to drop the tank and replace the float and sending unit. This is a common problem for alot of cars because of cheap gas. If you have to drop the tank check the fuel pump canster for dirt because of cheap gas. Replace the fuel pump strainer and fuel pump filter. If the car or truck has about 100,000 miles you might want to change the fuel pump at that time also just to cover your back. If you take it to a shop they will charge you at least $900 to start. But if you do it yourself it will cost you about $200 dollars maybe alittle more.
Posted on Mar 20, 2009
Best do a fuel pressure test. Should have chg. fuel filter from the get go. The only other filter is on the end of the fuel pump in tank. Bad gas and dirty gas will plug up fuel filter, hense burn pump up.
Posted on Apr 11, 2009
Backfiring after warming up can be from many things.
One that comes to mind is carbon deposits on valves, causing them to not close properly. The carbon deposits would also heat up and then ignite air/fuel mixtures before the spark plug can fire.
Or you would have hot exhaust gasses leaking back into the cylinder on intake and that would ignite the fuel.
Tac gauge fluctuating, and engine running rough on acceleration could be a vacuum leak, do you hear a hissing sound when the engine is running? listen closely under the hood. If you have a vacuum leak you would lose power and your RPM would fluctuate oddly. As for the backfire however, there are probably more than just one problem. Its hard to say for sure.
So please, more details, noises you hear, when exactly everything happens etc.
What speed and RPM the engine begins to bog down at, does it stall? What range is ur tac fluctuating at? anything you can think of, throw it on there.
Hope this helps you
Posted on May 10, 2009
Well if theres power going to the relay but not out, then you need a new relay. If theres power in and out of the relay, you might need a new fuel pump. The electric fuel pumps inside the tank are actually lubricated by the fuel as it pumps it, and if it runs dry long enough, it can burn out the pump
Posted on Aug 03, 2009
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