Fuel pump

[therangeringo]

Hi.

Yesterday I was at a friends house
His 2009 5.7 ram doesn't start. When I spray some starting liquid in the intake it does run
The fuse M22 remains under power even with ignition turned off. I can t here the fuel pump when I'm under the truck.
Can I check other things?
Sorry for my language if it's not 100% perfect.
I'm from Belgium.

 

[Ken226]

Yes. With a scan tool, you can turn the fuel pump on and listen for it running. Also, when you turn on the fuel pump with a scan tool, listen for the relay inside the TIPM to click.

You can test the fuel pressure.

You'll need the gauge and fuel rail adapter
Fuel Pressure Gauge, Pro Fuel Injection Pressure Tester Kit 0-140 PSI with 9.49,7.89,6.30 Fuel Line Fittings Fuel Pressure Test Kit https://a.co/d/01DcUSuV

Connect the gauge and adapter (videos on YouTube), then crank the engine and see what the fuel pressure is while cranking.




You can get a wiring diagram and check for electrical power at the fuel pump connector.

 

[therangeringo]

Hi.thanks for the reply.
Is it normal to have current on the fuse with ignition switched off?

 

[RamDiver]

Hi.thanks for the reply.
Is it normal to have current on the fuse with ignition switched off?

Are you referring to fuse #22 Ignition Switch feed?
That sounds a bit odd. How much current?

I've attached a fuse voltage drop chart. Measure the DC mV across the fuse in question.
The mV value will translate into mA of current draw.

.

 

[therangeringo]

Hi.yes the m22..key not in the ignition barrel i have 12volts on the M22 fuse

 

[therangeringo]

Oh u were talking about amps..I had it about voltage

 

[therangeringo]

Hi.. also a new battery drains empty in 12hours

 

[RamDiver]

Hi.. also a new battery drains empty in 12hours

Mystery currents are common in vehicles loaded with electronics.
There are a few different techniques to isolate the source.
I prefer using a DC clamp meter.
Searching threads here, you can read about other methods.

Before starting the tests, spend time measuring the current draw on all of the large red wires from the positive battery terminal. Measuring before and after the sleep state. Number the test points and keep notes of the values.

Then lock the truck with the hood open. Leave the FOB in the house and come back after 10 or 15 minutes. I believe the sleep state measurements should not exceed 15 mA.
Someone more familiar with a 2009 Ram truck may know better.

I bought this DC clamp meter on sale from Amazon for less than $50 CAN.
There are many clamp meters to choose from.
I chose this one because of the 6000 counts sampling rate, and the resolution scales are sufficient.

https://www.amazon.com/Multimeter-Auto-ranging-Resistance-Capacitance-Temperature/dp/B096TRZXTZ/ref=sr_1_5?crid=2M71AF14TPSZL&dib=eyJ2IjoiMSJ9.V58OfpZPOpFIK8r-BSMpq5Z4hkayNqLSNkLUhpt8W_wCcr4h7rCOV10w1MaCvzAqW7BVY8bRMtolJaFbJy1IJr8gUdlbrwbfSWkEtnN2boAKHCSkmaBmigSdhsKk2pFJ4k6WxsvvXMP2TFCYNltlIxw-G9aidk4fxJ13SahLAIHtmk93Ytj_ldd9ef_GIkj9xr6UKiwqphSzybmTck_byimmC797caiX8sg7A22SdFo.Cr_gJl3Etc_3Vj23zpG8wNSl8tPRhCmhWceYnfLbOHs&dib_tag=se&keywords=ht206d%2Bclamp%2Bmeter&qid=1778434029&sprefix=HT206D%2Caps%2C1961&sr=8-5&th=1

Pulling fuses is one method used, but there's always a possibility of waking the sleep state and having to wait for it to resume before continuing.

I prefer to use the clamp meter to determine the amount of mystery current, then use a multimeter to measure the voltage drop across the fuses.
Using the fuse voltage drop chart from above.

Once an excessive current draw has been found, pull that fuse and wait for sleep to resume.
Verify the current was interrupted by pulling the fuse with the clamp meter.


Until this mystery current is corrected, either disconnect the negative battery terminal or add a battery maintainer for overnight.

.

 

[therangeringo]

Ok..thanks for the help.. I'll figure it out..

 

[RamDiver]

Ok..thanks for the help.. I'll figure it out..

You're most welcome.

If you have any questions, just add them here.
Another member might identify their preferred method to isolate mystery currents.

You can search using the Search button on the upper-right corner, or your favorite search engine with something like; mystery current ramforum.com .


And welcome to Ram Forum.

.

 

[Ken226]

One of my favorite methods is to use a thermal camera. It works more often than it doesn't.

For those that don't already have one, it has the added benefit of giving you a good reason to buy another useful tool.

Whatever is drawing current usually generates heat.



When that doesn't work, I do exactly what was described above. The amp clamp and checking voltage drop across the fuses.

 

[04fxdwgi]

One part that I have seen drain batteries pretty frequently is the alternator diode packs. Check your parasitic drain, then disconnect the alternator power output lead and see if it changes.

 

[therangeringo]

Biggest issue is it doesn't have fuel...i think fuel pump stays constantly powered

 

[RamDiver]

Biggest issue is it doesn't have fuel...i think fuel pump stays constantly powered

That should be easy to test.

Measure the voltage drop across the fuse or use a DC clamp meter on the positive power lead to the fuel pump.

Then measure the fuel line pressure as described above by Ken.

.

 

[therangeringo]

No fuel pressure..pump doesn't run.. as it's not my vehicle but my friends the only quick check i did was spraying starting liquid in the intake..then it starts

 

[RamDiver]

No fuel pressure..pump doesn't run.. as it's not my vehicle but my friends the only quick check i did was spraying starting liquid in the intake..then it starts

This sounds like the truck has at least 2 faults, but possibly more.

At least a fuel related issue and a parasitic or mystery current.

I would focus on the power problem first.
Get that sorted out and then pursue the fuel issue.

Parasitic current draw faults are relatively simple to solve, but can be a bit slow and tedious.

Stay focused and follow the directions above. You will find the offending circuit and then will we can fault find to get that working properly.

Once you get the parasitic power problem fixed, crawl under the truck to verify power and a functional ground connection for the fuel pump.

Older trucks are prone to poor and corroded ground connections.

.

 

[Tominator223]

Try swapping the relay. Sounds like it may be stuck. No fuel & pumps running , it has probably overheated that pump.