Resolved Help! - Fuel Problem

S

sfckelley

Member

Oct 3, 2023

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Ohio

Oct 10, 2023

#1

• Oct 10, 2023

• #1

I have been studying the “cranks, no start“ troubleshooting thread for a bit now. My situation: 88 GT cranks and no start after I replaced the battery and start solenoid. Tonight I replaced the fuel filter and cycled the key while it was off to check fuel pump - got fuel out of the supply side, so pump and filter is ok. If the fuel relay is bad or the inerita switch was tripped, I would not have power to the pump, correct?? I do not have any pressure at the Schrader Valve. I did spray start fluid into the intake and she fired right up, but died after the fluid burned up. That means I have spark if I’m thinking correctly (I’m by no means a mechanic). Could the ignition or fuel relay still be bad?? I am planning to check them anyway tomorrow, but I am getting frustrated and had to walk away tonight. The car does have almost a full tank of gas - it smells ok to me, but I have no idea how long it has been sitting.

 

qikgts

Active Member

Nov 12, 2001

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FLORIDA

Oct 10, 2023

#2

• Oct 10, 2023

• #2

Sounds like you have a restriction somewhere in that fuel supply line. Did you maybe crush a line with a jackstand or a jack?

You are correct so far in everything you've said, so no issues with any of the relays or ignition components. If the gas doesn't stink like ty liquor then I'd say it's fine. lol

 

bird_dog0347

still married haven't seen testicles in years

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Oct 11, 2023

#3

• Oct 11, 2023

• #3

It is possible the pump is just very weak and is only able to push it to the filter but not all the way up if you get no pressure at the Schrader valve, assuming you can't find a mechanical/physical blockage in the lines.

 

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S

sfckelley

Member

Oct 3, 2023

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Ohio

Oct 11, 2023

#4

• Oct 11, 2023

• #4

Could be the pump, I am sure it is original. The car only has 34,000 miles on it. My brother in law said he had it running in June, but I am wondering what year he was talking about… could it also be the fuel pressure regulator??

 

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limp

wrap a little cheese around it and its a done

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#5

• Oct 11, 2023

• #5

sfckelley said:

My brother in law said he had it running in June, but I am wondering what year he was talking about…

Click to expand...

LOL

 

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S

sfckelley

Member

Oct 3, 2023

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Ohio

Oct 11, 2023

#6

• Oct 11, 2023

• #6

Is there a way to test either a fuel line restriction or for a bad fuel pump?

 

General karthief

wonder how much it would cost to ship you a pair

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Oct 11, 2023

#7

• Oct 11, 2023

• #7

Pull the line off the fuel filter and blow air back towards the tank, if its clear you are likely dropping the tank, the fuel pump has a short hose from the pump to the hanger that rots, splits and leaks, won't build pressure.
I take it that this stang is new to you.

 

S

sfckelley

Member

Oct 3, 2023

7

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13

Ohio

Oct 11, 2023

#8

• Oct 11, 2023

• #8

General karthief said:

Pull the line off the fuel filter and blow air back towards the tank, if its clear you are likely dropping the tank, the fuel pump has a short hose from the pump to the hanger that rots, splits and leaks, won't build pressure.
I take it that this stang is new to you.

Click to expand...

Yes, it is. After my father in law died, mother in law allowed my brother in law to keep it. He has not touched it since "June"... Claimed he had it running, but I have my doubts. I just got the car to try to restore it, she wants to drive it at least one more time. I thought I was just putting the interior back together and cleaning the car up a bit, but as it turns out, there are bigger issues and I'm in over my head! I just changed the fuel filter last night and cycled the key to see if I had fuel coming out of the tank when the pump primed and it did. So I was thinking the fuel pressure regulator, but now it seems I may be swapping the pump. Good times!

 

AeroCoupe

lube between the nut and the face. I know my lubes

Founding Member

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Oct 11, 2023

#9

• Oct 11, 2023

• #9

May not help one bit but have you checked for codes?

Electrical - How To Pull Codes From EEC-IV In 86- 95 5.0 Mustangs

@Noobz347 - The code dump procedure isn't in the sticky - you may want to add it... Dump the codes: Codes may be present even if the Check Engine Light (CEL) isn't on. Dumping the computer diagnostic codes on 86-95 Mustangs Revised 26-July-2011. Added need to make sure the clutch is...

stangnet.com

Just to recap, you have voltage to the pump and the ECU is commanding the prime cycle of which all are good signs. If you can hear the pump run then the inertia switch is not tripped.

You could have a blockage after the fuel filter which can be checked by disconnecting the fuel line from the pump at the fuel rail and after the fuel filter and blow compressed air through it. My guess is this is all fine is you do not see any visual crimps in the lines.

I would be leaning towards a weak pump or the "S" hose that connects the pump to the hanger of which General and bird_dog covered. Do youself a favor and replace the pump and hose if you pull the tank. I would suggest a Walbro 190lph pump as that will provide plenty of fuel if you ever decide to warm the motor up with a head, cam, and intake swap and even some larger injectors.

LMR has them as do other vendors:

https://lmr.com/item/LRS-9350B/1986-97-Mustang-190-Lph-Walbro-Gss242-Fuel-Pump

Another thing you can do before dropping the tank is to put a fuel pressure gauge at the schrader valve location on the fuel lines before the injector rails and see what pressure you are actually getting.

 

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bird_dog0347

still married haven't seen testicles in years

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#10

• Oct 11, 2023

• #10

The regulator is on the far side of the Schrader valve IIRC so if no pressure at the valve you won't see it at the regulator either (I think, my car isn't here).

 

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AeroCoupe

lube between the nut and the face. I know my lubes

Founding Member

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Oct 12, 2023

#11

• Oct 12, 2023

• #11

FPR is downstream of the Schroder valve.

 

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S

sfckelley

Member

Oct 3, 2023

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Ohio

Oct 22, 2023

#12

• Oct 22, 2023

• #12

Well thank you all for the assist, it was indeed the fuel pump! Got it replaced today and she fired right up!!!

 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

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Oct 25, 2023

#13

• Oct 25, 2023

• #13

Note the bad fuel pump pandemic we've had around here lately.

 

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