How do I know if it's my fuel pump or the fuel filter

dayrous
5

Asked by dayrous Aug 08, 2007 at 01:08 PM about the 1993 Toyota Camry

Question type: Maintenance & Repair

I have dummy written on my forehead.  I'm stuck trying to make sure a mechanic isn't taking advantage of me. I have gotten 3 guestimates as to what's wrong it's just that they all say that if it truly was the fuel pump it should have given me some type of warning. Which it didn't. My son (14yrs old) was sitting in the car with it running while i ran into the store. When i came out the radio & everything was still on, but i could tell the car wasn't actually running. my son said he didn't turn it off. when i tried to start it, it wouldn't start. i checked the battery, starter, & it so happened i had a full tank of gas.. how can i verify that it's my fuel pump?

34 Answers

littlehorn
32,135

You can check for power to the fuel pump, but that will require some disassembly to get at it. It's certainly not a fuel filter as I have never seen one on a modern vehicle get so clogged as to cause a no-start situation. You can attempt to listen when you put the key in the ignition and turn it to the "Drive" position -- the fuel pump relay will energize the pump and it will run for a few seconds to pressurize the system. If you don't hear this, either the fuel pump or the relay is bad. And it's not true that a bad fuel pump would "give you some warning." When they go, they go, and they won't necessarily extend you the courtesy of acting up before they stop working.

28 out of 28 people think this is helpful.
mlcharlestonsc
235

I had simular problem took me a week to figure out. Thought the same thing fuel pump pulled line off to relive pressure let it drain hook back up try to crank it up un hook fuel line if line has pressure fuel pump good. Ended up being the ignition coil. This is an internal coil that is located inside the distributer cap. Got the part at Auto Zone fixed it myself. hope this helps and not to late.

14 out of 14 people think this is helpful.
papa
Not Active

to rull out fuelpump take gas cap off put your ear close to opening ,have someone turn key switch on and off 3 or4 times if you hear a buzzing sound not f.p if no sound a bad f.p. also check ecm fuse in fuse box.

23 out of 23 people think this is helpful.
Sheptars
1,820

Did the car start and then shut off?

82 out of 82 people think this is helpful.
Sheptars
1,820

Did the car start and run for a few seconds and then turn off?

100 out of 100 people think this is helpful.
Enaid Abikb
370

I am having the same problem. I changed the fuel pump twice.My son said that fuel filters don't get clogged.So i would think it would be the fuel pump.

21 out of 21 people think this is helpful.
Buddy Rich
200

Hey Mick, it is most likely the fuel pump. The fuel pump will sometimes allow you to be driving and will keep going until the RPMs drop and it starts to idle it will die because the pump wasn't working it was the pressure that was allowing you to keep going but when you stop and start idling it will die because the pump stopped and the pressure died as well. I hope this helped.

20 out of 20 people think this is helpful.
ken3434
250

i pulled my fuel filter off and brackish brown fluid came out of the lines and the filter. does this mean i need to replace my filter or should i put it back on and try to start the truck?

25 out of 25 people think this is helpful.
Certimafied
100

Your son is wrong fuel filters get clogged. The answer to the other question is yes the fuel should be a clear green/yellow color, the black brown stuff is the trash it has picked up over the years/miles.

10 out of 10 people think this is helpful.
ARM5
540

whats happing to me,is that my car starts up every morning, but if i stop for coffee and that takes about five mins, my car won't start. so i have to sit for about three till i could start it up again.

54 out of 54 people think this is helpful.
brandimf92
155

my car will only go to 40 then it will die. the RMP will go down then when you step on the gas it wont go past 45

15 out of 15 people think this is helpful.
myemle
100

There are two causes that make your car to stall out & die! First ignition system, second fuel related. By taking the guess work out you need to buy or rent a fuel pressure gauge so you can check for fuel pressure and volume and compare it with the spec's of your vehicle(if you replace a bad fuel pump you also need to replace the fuel filter). If your fuel pump pressure and volume is within spec's then you need to trace down what cause your ignition to fail(this could be ignition module, ignition coil, injector pulse,etc.

9 out of 9 people think this is helpful.
nogenius
190

One sure easy way to check if it's your fuel pump. Have someone bang on the gas tank pretty hard while your trying to start the car works everytime for me.fuel filters should be change ever so often because there filtering out the junk in the fuel line an build ups can often cause blockage.

2 out of 2 people think this is helpful.
Mygreatcar
80

My problem is a fuel gauge which is off most of the time, it shows full tank even when i have half a tank or quarter of a tank. So what is the problem, is it Fuel Pump, Relay, floater or anything else.

5 out of 5 people think this is helpful.
nogenius
190

Whats the year make model

4 out of 4 people think this is helpful.
nogenius
190

The float has been known to cause this type of issues.but it dont effect the fuel pump.sometimes the float gets filled up with gas.

4 out of 4 people think this is helpful.
Mygreatcar
80

It is 95 Camry with fuel gauge problem.

3 out of 3 people think this is helpful.
bfrank
10

i have a 94 camary its dumping to much gas in the engine its making it come out the muffler anyone know where to start i ran codes and it said throttle sensor i changed that but still doing the same thing

1 out of 1 people think this is helpful.
myemle
100

first i make sure all my vacuum hoses and wiring connectors connected to manufacture specification, second i check the charging systems. Then I pull out all the spark plugs to find out which cylinder is flooded, if only one spark plug is wet than that injector could be leaking or control ground to injector/pulse width is short to ground or computer control is bad, if they all wet you may have a high fuel pressure, next i checked wirings, O2, MAF, MAP, ECT

1 out of 1 people think this is helpful.
Ttee
70

I am also having a similar problem with my cavalier.. my car wont start, it happened one time about 2 months ago and i hit the tank and it started, then again about a week ago it happened again. I hit the tank again and it started. Now two days later it died on me and it wont start at all., but i hear the fuel pump start when i turn the car on. Can it still be bad?

7 out of 7 people think this is helpful.
BroncoOwner86
20

I had the same issue in my Ford Bronco, turn the key and heard a noise I thought was fuel pump running, but was actually the fuel pump relay engaging. Took fuel pump out of tank and tryed and it was dead, so make sure what you are hearing is really the fuel pump not the relay

2 out of 2 people think this is helpful.
Lance Papillion
20

I have a 2002 toyota camry when I try to start it it don't start it have really low starting pressure

2 out of 2 people think this is helpful.
alaska113
10

I have a 98 Camry I replaced the fuel pump on.. not the problem. Fuse seems fine as does the relay(I inserted a like relay in as well, same result. At the five prong harness to the pump, when key is activated I get 12V at the far left of the three prongs, and 7V in the middle..not certain how the float switch interfaces here... 12V direct to the two prongs on the pump assembly runs the pump..

1 out of 1 people think this is helpful.
Carlos Word
10

I am having a similar problem I have a 2002 Ford zx2 and all of a sudden it died my rpm was up then went down then went back up then down. Do I have to change my filter or my pump, if it's my pump how do I actually take it out, I took the case and off and I see the pump the only thing is I try to pull it up and it won't budge how do I pull it out. Please help

1 out of 1 people think this is helpful.
Crystal Hayes
0

I have a ? Im trying to find out if its my fuel pump or fuel filter when I turn the key I still here the buzzing (2001 Pontiac sunfire) please help someone thanks in advance PS my car won't start

mick_barnes
495

same sort of thing is happening with my car everything was running well no sign that there was anything wrong with the car then when i stopped at a set of traffic lights the car just started to splutter and die and i cant get it restarted for the life of me it's currently sitting on the side of the road near where it died would appreciate any advice on what could be causing this problem thanks

49 out of 49 people think this is helpful.
daviddt
130

Fuel pump diagnostic: FIRST - Before doing anything, use starter fluid in the air intake and attempt to start the car. If it easily starts and runs until starter fluid somewhat immediately burns up and the car dies again, you have ruled out air or spark issues. The car is proven to run if it gets fuel. THEN 1) key power on car without starting and listen for fuel pump to cycle.. may be necessary to have someone actually put ear close to open fuel fill opening as some are very quiet. 2) Check both the fuel pump fuse and fuel pump relay in the power distribution box under the hood. It is a black box with a lid held on by tabs. The under side of the lid usually has the schematic of which fuse is what. If not, Google search for your vehicle. The relay should have a click sound when someone key on the vehicle without actually trying to start it. If the person tries to start it, you won't be able to hear click due to engine noise. 3) Check the pressure on the fuel rail using an appropriate fuel pressure gauge. There is a valve with cap similar to the valve and cap ending on a tire. No pressure means fuel pump not working. *Another quick check is a manual depression of the valve stem to see if a fuel will come out under pressure. 4) But, check voltage near pump. The pump may not be working as it failed, OR there may be a bigger issue of not getting power.This may require some work as the tank often has to be dropped to complete this step. If you are getting power, but no pump noise.. Sorry, it is the pump.

13 out of 13 people think this is helpful.
CarNoobie92
20

Wow. I now see this problem is pretty common. My 2002 Pontiac Sunfire is turning my hair gray. Was driving fine, but I made a stop at the store then it wouldn't start back up. Had it towed home. Two days later I ran errands ALL day. Went home. Tried to leave back out, but it wouldn't start. Spraying starting fluid into the air intake gets it started then it shuts off 3 seconds later. I'm going to re-read these posts and see if I can figure this out.

1 out of 1 people think this is helpful.
CarNoobie92
20

I'm still not sure how to determine if it's the filter or the pump. Of course I'd rather it be the filter (MUCH cheaper to fix) Lol. I don't want to get the pump changed and it only needed a new filter.

1 out of 1 people think this is helpful.
Subaru77
0

So I don't know if this helps out all but I had a similar problem... Check your spark plug wires. Took a nap in my car one day (had a long break in between a doubel shift and I live to far away) had the car running for maybe an hour, fully turned on but when I woke up, it was quiet. Radio and lights are still on but the engine wasn't. Tried to start the car. Battery was dead. Got it jumped... Assumed that was the problem. Next day I turned on my car, started driving and I felt like the engine had no power. The engine started missing and it acted like it was gonna die. Took it to the mechanic. His code showed a cylinder 4 misfire. I have 4 cylinder engine. He drove it, it drovr just fine, guessed that I just needed a new engine coil. He Put one in. With in the same day it happened again. Car struggled under pressure and would start to miss. Took it back, this time he says he could hear the spark plugs snapping. He replaced my old coil, refunded the money and just charged me for labor and the spark plug wires. It's been about a week now and my car has been fine. I'd check those. It's probably your problem.

Norman Hubert Sr.
0

My 1997 Silverado I've changed the fuel pump still here no sound from pump truck just spinding what could it be.

Norman Hubert Sr.
0

I'm going to change filter 2 checked all the fuses they all good .

Christina Miller
10

94 Chevy Camry fuel pump works but how come my car runs a while then dies and gotta wait 35 to 45 min till it runs again

1 out of 1 people think this is helpful.
godlylove1234
0

I have. A 2004 grand marquis it all of a sudden died on me while driving on the loop it's not my battery of alternator what can It be

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