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  #1  
Old 04-18-2013, 09:21 PM
Danny7 Danny7 is offline
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Default Bad relay?

Hello all. I was leavin work today ad I was accelerating in the parking lot my truck all I a sudden died. Tried starting it and cranks fine. Fuel pump doesn't purge when key is turned. Can a relay just all of a sudden go? I feel it is either a relay or a ground wire snapped or fell off. Truck came with a bypasses intertia switch so it can't be that. Isn't check for spark since I was at work but pretty sure there is.

Thanks
Danny

----------

It isn't the TFI either
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  #2  
Old 04-18-2013, 09:34 PM
Sub74 Sub74 is offline
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Need to see if you have 12 volts at the fuel pump
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1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year
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  #3  
Old 04-19-2013, 09:32 AM
Psychopete Psychopete is offline
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Default Re: Bad relay?

you can also ground the fuel pump test on the diagnostic connector to override the computer control over the fuel pump relay.
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  #4  
Old 04-19-2013, 10:59 AM
Danny7 Danny7 is offline
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Default Re: Bad relay?

Which slot/wire in the diagnostics connector is it?
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  #5  
Old 04-19-2013, 11:04 AM
adamhos adamhos is offline
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Default

You can always swap with a like relay(that you know is good) to test...other than that you need to check for voltage at the pump
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  #6  
Old 04-19-2013, 12:07 PM
Psychopete Psychopete is offline
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Default Re: Bad relay?

Quote:
Originally Posted by Danny7 View Post
Which slot/wire in the diagnostics connector is it?
google images has a picture of it
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  #7  
Old 04-19-2013, 12:45 PM
Danny7 Danny7 is offline
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Default Re: Bad relay?

Alright I will take a look. Got a new relay just for the hell of it and it isn't the relay.
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  #8  
Old 04-19-2013, 12:54 PM
adamhos adamhos is offline
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I would say you probably need a new pump
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  #9  
Old 04-20-2013, 02:24 PM
Danny7 Danny7 is offline
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Default Re: Bad relay?

So I jumped the fuel pump And it is good. Tried starting the truck with it jumped and it wouldn't start. It isn't getting spark it seems like. There is power to the coil too. Maybe the tfi could be the problem? Could a bad tfi prevent power to the fuel pump?
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  #10  
Old 04-20-2013, 03:13 PM
Danny7 Danny7 is offline
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Default Re: Bad relay?

Just shot starting fluid in the intake and it sputters. So there IS spark.
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  #11  
Old 04-20-2013, 06:57 PM
Sub74 Sub74 is offline
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You need to check the fuel pressure at the shrader valve
You also need to test the injectors with a NOID light
Knowing those two things will point you in the right direction
Has the truck sat for a long time?
I had similar issues with a tank of bad gas - my truck had sat for about 60 days
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1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year
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  #12  
Old 04-21-2013, 09:57 AM
Danny7 Danny7 is offline
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Default Re: Bad relay?

It has pressure and it is a daily driver. I just recently filled up. Could it be the Ecu?
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  #13  
Old 04-21-2013, 10:46 AM
Sub74 Sub74 is offline
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Have you tested the inertia switch?

You need to test the injectors with a NOID light

If you have no signal to the injectors it would be the ECU

There are two wires on an injector one is constant 12V the other is a ground signal that comes from the ECU. the injectors are set up in two groups of three

Three injectors fire each time the ECU sends the ground signal

So you only need to test two of the injectors to find out if all 6 are firing

I'm sure someone knows which pin on the ECU is for the ground signal if you do not have NOID lights

By-the-way NOID lights are cheap, you can get them at almost any parts store

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Went back & looked, inertia switch is already bypassed so ignore that comment
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1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year
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  #14  
Old 04-22-2013, 11:28 AM
Danny7 Danny7 is offline
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Default Re: Bad relay?

Alright I am going to repost all the symptoms.

-turn key doesn't prime pump
-truck has full power, cranks over but doesn't start
-jumped the fuel pump and it runs.
-tries starting truck with jumped fuel pump but doesn't start.
-sprayed starting fluid in intake and tried starting and it spudders.
-truck has bypasses inertia switch.
-truck has spark.
-fuel injectors not squirting fuel.

Alright I will go pick up a noid light. Hopefully it tells me exactly what's wrong with the truck.
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  #15  
Old 04-22-2013, 11:30 AM
Psychopete Psychopete is offline
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Default Re: Bad relay?

the pins for the injectors banks are 58 & 59. They are grounds, 12v+ runs to the injectors at all times when the key is on run. Double check the small single ground wire coming off the battery that goes into the mainharness, that connector is a piece of junk. Might also see what happens when you disconnect the MAP sensor. Bad ECM is possible, but keep looking first. fir a noid light you can use a 194 bulb with the legs pulled out and put into an injector connector.
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