Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [fuel-pump]

The pump or pumps in a vehicle fuel system that move fuel from the tank to the engine and that may also provide fuel pressure in gasoline engines. This pump may also be called the lift pump to distinguish it from the injection pump of a diesel engine.

Fuel pumps are designed to withstand the stresses of pumping gasoline and/or diesel. Fuel pumps are designed with safety components to prevent the discharge of static electricity frequently associated with the pumping of fluids.

Image of an electric fuel pump

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Does the amount of fuel in the tank matter?

As long as there is some fuel in the tank, does the fuel level matter? In other words, is it advisable to make sure the tank is mostly full most of the time, or is this just silly? In other words, are there valid reasons why you should avoid running…
Ola Eldøy
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Is it bad on your fuel pump to have your tank run low?

Ive always been taught it was bad on your fuel pump to run your vehicle tank close to dry as it would damage the fuel pump but Ive never seen any validation to support this statement. So will running a tank dry before fill up damage your fuel pump?
Hᴇʀʙɪᴇ
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Two Fuel Pumps died

Already having replaced 2 fuel pumps, both died. Seems to have a problem in somewhere (alternator, battery, electricity) or I have no luck for fuel pumps. The last one, last 6 months, before died completely, it start making a loud noises. Vehicle:…
aspirinemaga
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Why is the effect of a bad fuel pump more noticable at higher speeds?

I get that the main effect of a bad fuel pump is that the engine will cut out at higher speeds, and that this is often not easily noticeable until that happens because there are little or no prior indications that I am aware of. And that this…
Max Goodridge
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Failure to start in frigid temperatures

RE 2001 Ford Explorer It has a new battery, coil, and wires in place. The truck will not start below -7 F despite strong cranking; in these temperatures, sound of fuel pump priming is muted or absent. Upon rewarming, the truck starts briskly and…
srlmedipro
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Do I have a fuel pressure or injector problem Part 2

This is a continuation of my previous fuel pressure / injector question. So the missing part for my fuel pressure gauge came in and I was able to do a few more tests. The first thing I think is that there may be multiple problems here. I both did…
Robert S. Barnes
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Can't find out a correct fuel pump for my vehicle

I have a 2008 Dodge Charger SRT8 6.1l. The trick is, that I need a fuel pump replacement for that vehicle and I can't find the appropriate part. Fuel tank capacity is 72 liters (22 gallons)... On the market, there are only 18 gal and 19 gal versions…
Daniel
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Do worn brushes in an electric fuel pump increase fuel flow rate?

Electric fuel pump manufacturers can provide pump curves like this one below by Pierburg: I wanted to confirm my understanding of the curves when simulating the effect of worn brushes in the electric motor: The pump pressure and fuel flow rate…
Zaid
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Does electric fuel pumps run at constant or variable speed?

In websites I have seen that fuel pumps have a pressure range of say 30-95 psi. Why do they give a range of pressure? I had read that these pressure values refer to the unobstructed flow pressure delivered by pump. I had read about pressure…
Heatgunner
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Engine lean issues

Vehicle is a 2006 Ford Courier, started having hesitation/loss of power after fill up at a gas station that I'd never been to before. I depend on it for transport so I'm forced to still drive it, which does work, but it refuses to go above ~3000 rpm…
Aaron Patrickson
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How to disassemble Pierburg electric fuel pump

I've recently replaced my fuel pump on my W202. The one I replaced seems to be the one that was installed in the factory as it has the MB logo and is made by Pierburg. The new one is from Bosch. In fact, I replaced it because it was making some kind…
Mikayil Abdullayev
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Do I have a fuel pressure or injector problem, or am I just chasing ghosts?

I just did a fuel volume test on my 98 Mazda 626 2L GF. According Tim Giles book Automotive Service: Each injector is energized for 15 seconds... Variations of more than 5 ml calls for replacement of the injector. In the 626 workshop manual, it…
Robert S. Barnes
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Diagnosing fuel pump relay on 2004 Acura TSX

My wife's '04 Acura TSX began having issues starting towards the end of last summer. It would turn over just fine, but took 5-10 seconds to actually start running. The problem was intermittent - some days, it would start fine, other days were…
John Chrysostom
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BMW E60 (525d M Sport 2005 UK). Cranking but not starting. Fuel Pump/Relay issue?

Background: Long term bad earth problem has been causing iDrive to crash and reboot for years. Bad earth seems to drain the life of the battery over a period of a few years. On my 3rd battery now. Never been able to find the bad earth. I am told…
S Thomson
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Why is a volume test necessary when diagnosing fuel delivery problems?

I suspect my fuel pump causing intermittent driveability issues. I checked the fuel pressure at the fuel rail and it seems like the pressure is fine: ~2.4 bar at idle, 3.1 bar at engine off (3.09 bar pressure regulator). However I was told that the…
I have no idea what I'm doing
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