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Wiring what causes low voltage to fuel pump for a 1997 f-150 4.2

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Could be a faulty relay?

Posted on May 25, 2008


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Would codes 33 and 54 cause a 93 oldsmobile cutlass supreme not to start

Code 54 is fuel pump circuit, Low voltage,will cause car not to start. Wiring open circuit/short circuit to ground, fuel pump relay, engine oil pressure warning lamp switch
Code 33 is MAP sensor,voltage high, low vacuum indicated.
Wiring short circuit to positive, hose blocked/leaking, MAP sensor, ECM

Check the attached links,
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

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S10 chevy when driving sputters and pops loses power will not pull on a HILL

have exhaust shop check your catalytic converter ,for free,if you have more than 100k mile,if that turns good,check your fuel pressure,if pressure low ,first buy fuel filter if that,didn't help,then you may need fuel pump,assuming you already checked the 12 volt goes to pump( bad or dirty ground wire to pump causes low voltage to pump,therefor low pressure under load)

Oct 20, 2014 | Chevrolet S 10 Cars & Trucks

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Code p0157

DTC P0157 HO2S Circuit Low Voltage Bank 2 Sensor 2

Check for the following:

HO2S wire - Sensor pigtail may be mispositioned and contacting the exhaust manifold

Intermittent ground in the wire between the connector and the sensor

Poor VCM to engine block ground

Lean injector(s). Perform Fuel Injector Balance Test for the 5.7L or the 7.4L.

Fuel contamination. Water, even in small amounts, near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a DTC P0151

Fuel pressure. System will be lean if pressure is too low. It may be necessary to monitor fuel pressure while driving the vehicle at various road speeds and/or loads to confirm. Refer to Fuel System Diagnosis.

Exhaust leaks. If there is an exhaust leak, the engine can cause outside air to be pulled into the exhaust and past the sensor.

Vacuum or crankcase leaks can cause a lean condition and/or possibly a high idle.

If the above are OK, it is a faulty HO2S.

Never solder the HO2S wires.

Jun 03, 2014 | 1997 GMC Yukon

1 Answer

Fuel voltage regulator low help

i will help if i can but your english leaves a lot to be desired here sorry ,fuel voltage ?? pressure low?? normally these cars do not go wrong but the fuel pump can fail at times causing low fuel pressure or the gauze filter on the bottom of the pump is choked up

May 24, 2012 | 2004 Peugeot 307 1.4

1 Answer

Engine light on. scanned and p1388 code. What is the meaning of this code?

P1338 - Fuel Pump feedback circuit low/high voltage. This is indicating that your fuel pump is either getting too much voltage or too little voltage as is sensed by the fuel pump control module. Now, this can be caused by either bad wiring connections or a battery not charging causing low voltage. Should read 14 1/2 volts if charging at 1500 rpms

Apr 15, 2011 | 2002 Jaguar S-Type

1 Answer

I did a censor check on my 1991 Lumina with the 3.1 engine and it says I have low voltage to my fuel pump. what would cause it to have low voltage?

A bad/dirty circuit connection from the Control relay to the pump, or a wiring chafe that is leaking off current to the Pump without "popping" the Fuse. Regards,David

Nov 28, 2010 | 1991 Chevrolet Lumina

1 Answer

1988 f-250 w? a 351 windsor is it the map sensor?

HI. there are several problem areas that will need to be inspected. follow the list below to address this issue further.


1. Fuel Filter. If the filter has not been change recently, this will be the culprit. Clogs in the filter will cause surging. replace if needed

2. Intake Manifold Gasket. Check this gasket for leaks, or worn edges. replace if damage is visible.

3. Fresh Air Intake Hose. This hose may be clogged, or damaged. inspect for these faults. replace if needed.

4. Fuel Pump. A weak, or poorly grounded pump will cause low fuel pressure, in return, causing the surge effect. inspect the fuel pump for these faults. replace if needed.

5. Fuel Injectors. A dirty, or faulty injector will cause the surge as well. inspect the injectors for faults. replace any injector that is faulty.

6. Oxygen sensor(s). A faulty O2 sensor will promote surging as well. This will usually be accompanied by an illuminated check engine light. If this is the case. the O2 sensors should be changed.

7. Carburetor. A Dirty and Improperly Functioning Carburetor will cause the surge effect, also. Check to make sure the carb is functioning correctly(IF EQUIPPED)

8. Map Sensor . A defective manifold absolute pressure sensor may cause a rich or lean air/fuel ratio, excessive fuel consumption, and engine surging. this diagnosis applies to map sensors that produce an analog voltage signal. To check the sensor, back-probe the 5-volt reference wire(with the ignition on), and connect a voltmeter from the reference wire to ground. If the reference wire is not supplying the specified voltage, check the voltage on this wire at the computer. If the voltage is within specifications at the computer, but low at the sensor, repair the reference wire. When this voltage is low at the computer, check the voltage supply wires and ground wires on the computer. If these wires are satisfactory, replace the computer.

With the ignition switch on, connect the voltmeter from the sensor ground wire to the battery ground. If the voltage drop across this circuit exceeds specifications, repair the ground wire from the sensor to the computer.

This concludes the surge inspection chart. you will find the issue in one, or more of the areas stated above.

Nov 10, 2009 | 1988 Ford F 250

2 Answers

1996 chevy tahoe fuel system

check for voltage at the pump. If it has 12v there, (and a good ground) then pump is bad. there may be a pump fuse on the fuse block (can't remember) but if you find it has blown, the pump may be getting ready to fail. If fuse fixes the problem, replace it and carry an extra with you, then change the pump.

May 14, 2009 | 1996 Chevrolet Tahoe

1 Answer


Many wires on most autos will have low voltage around 5 volts is common for wires going to most sensors. What you described with the fuel pump sounds normal for this truck. I would guess the fuel pump is not your problem cant say for shore with out any more info. I am unclear as to what the symptoms are, is the truck not starting. What led you to check the fuel pump. Did you check for spark.

Jan 10, 2009 | 1991 GMC S-15 Jimmy

1 Answer

95 camry fuel pump low voltage

Check the EFI fuse. Is it blown?

Nov 14, 2008 | 1991 Toyota Pickup

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