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  #1  
Old 03-08-2013, 09:15 PM
2.9l 2.9l is offline
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Default no fuel pressure

I have a 1990 2.9l ranger that has no fuel pressure. things i have replaced so far-fuel pump, strainer, filter, fuel pressure regulator. i replaced the regulator because it was just pumping the gas right back to the tank. but the new one is doing the same thing. Did I get a bad regulator?? im out of ideas and don't want to buy parts I don't need. any help apreciated
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  #2  
Old 03-08-2013, 10:06 PM
Sub74 Sub74 is offline
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Check your inertia switch (rollover switch) it is I'm the passenger footwell on the firewall below the heater
You can by-pass it by disconnecting the elec plug and put a jumper wire between the two prongs
Easy to do. If it works then it was an easy fix
If not then post again and we will figure it out
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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 03-10-2013, 08:18 PM
Sub74 Sub74 is offline
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Did you get it fixed?
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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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  #4  
Old 03-11-2013, 06:23 AM
2.9l 2.9l is offline
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Default Re: no fuel pressure

No I took my fuel.regulator back and ordered a different one hopefully the new one will fix it. Gets here tuesday.
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  #5  
Old 03-11-2013, 01:26 PM
Sub74 Sub74 is offline
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A fuel regulator will not fix a "no pressure" problem

When a regulator goes bad it usually causes the fuel pressure to be too high, like 60-80 psi

A no pressure problem is a fuel pump or a fuel filter

The question is....
Is the pump getting electricity? Is it a pump or a wiring problem?

The easiest thing to check first is the inertia switch - if it is bad then no power is getting to either pump - then you check the fuel relay - then you check the actual wires etc. etc. until you find the actual problem

Don't throw parts at it until you troubleshoot
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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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  #6  
Old 03-11-2013, 03:16 PM
Psychopete Psychopete is offline
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Default Re: no fuel pressure

fwiw it will always drain back to the tank, fuel is in constant circulation in these return style systems.
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  #7  
Old 03-11-2013, 03:28 PM
Sub74 Sub74 is offline
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It will never cause "no pressure" it will cause the pressure to be low 10-15 psi or it will cause the pressure to be high 60-80 psi but a regulator failure will not cause zero fuel pressure

I never did ask him if there was fuel in the vacuum line
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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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  #8  
Old 03-11-2013, 06:25 PM
Psychopete Psychopete is offline
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Default Re: no fuel pressure

not in disagreement at all - the OP just mentioned that fuel was flowing back to the tank, which is normal, the pumps run all of the time when it's running - fuel keeps the pump cool so it has to be in constant circulation.

I am curious on how the no pressure was found - was it checked with a gauge or no fuel getting in to the cylinders?
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  #9  
Old 03-11-2013, 06:41 PM
Sub74 Sub74 is offline
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Didn't think you we're disagreeing just sending my thought process.
Good question tho - how did he determine there was no fuel pressure?
I presumed a gauge, nothing else would be accurate
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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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  #10  
Old 03-12-2013, 07:05 PM
2.9l 2.9l is offline
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Default Re: no fuel pressure

sorry guys for the bad explanation...the fuel was just dribbling out of the pressure release valve...got the new regulator in and now I have the pressure I need. but it just kinda sputters then dies, i was thinking clean up the injectors.
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  #11  
Old 03-12-2013, 07:16 PM
Sub74 Sub74 is offline
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Does the high pressure pump whine & prime the system when you turn the key on but do not start the engine?
It really sounds like the high pressure pump is not working
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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 03-12-2013, 07:52 PM
2.9l 2.9l is offline
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The 1990 only has the one pump in the tank and it does prime up when the key is turned on
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  #13  
Old 03-12-2013, 08:05 PM
Sub74 Sub74 is offline
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Ok I missed that it was a 1990.

Did you check the pressure with a gauge?

How old is the gas in the tank?

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How long did you have the tank open when you replaced the pump?

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I had a problem with a bad tank of gas that drove me crazy - had fuel pressure - had spark but would not run unless I was spraying fuel in the intake
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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 03-12-2013, 08:08 PM
2.9l 2.9l is offline
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I havent checked it with a gauge. But it looks like its holding enough pressure(40lbs)... the tank was open for about a day maybe a lil less. And the tank was on E with the old stuff.so i just added about three gallons of good stuff and injector cleaner
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  #15  
Old 03-12-2013, 08:18 PM
tadpole33420 tadpole33420 is offline
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Default Re: no fuel pressure

Quote:
Originally Posted by 2.9l View Post
I have a 1990 2.9l ranger that has no fuel pressure. things i have replaced so far-fuel pump, strainer, filter, fuel pressure regulator. i replaced the regulator because it was just pumping the gas right back to the tank. but the new one is doing the same thing. Did I get a bad regulator?? im out of ideas and don't want to buy parts I don't need. any help apreciated
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i honestly dont think your prob is a pump or a regulator. pull the connector off of the pump and use a multimeter to test for 12v with the key in on position with engine off. its very unlikely that you would have a plugged fuel line. but it IS possible for it to be dryrotted and have a tiny crack and that would make you lose pressure like that. make sure you didnt pinch any lines raising the tank back up
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*new GY wranglers 235/75/r15*new bumper and frame supports*rubberized interior floor* took off sway bars* bedlinered mirrors* new painted interior*aftermarket fog lights* polished lights* new motor and clutch for the 92* and trying to find a 93to 04 newer ranger to have 2 4wd's as im moving to the snow soon
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