94 f150 dead
Thread Starter
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New User
Joined: Jul 2011
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Pretty much convinced its pumps. Gonna pull the tanks tomorrow after work. There are fluctuations in fuel pressure. Replaced the pressure regulator, no change. The pressure is 34-35 it will start if the key is cycled a few times, but dies without warning due to a pressure drop. Let's hope this gets it. Will let you know.
Tony
Tony
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New User
Joined: Jul 2011
Posts: 17
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Pretty much convinced its pumps. Gonna pull the tanks tomorrow after work. There are fluctuations in fuel pressure. Replaced the pressure regulator, no change. The pressure is 34-35 it will start if the key is cycled a few times, but dies without warning due to a pressure drop. Let's hope this gets it. Will let you know.
Tony
Tony
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
The key being cycled will tell you nothing.
To check the fuel system you need to hook up the fuel gauge, ground pin #6 of the self-test plug or short pin#2 to pin#6 and turn on the key.
The selected fuel pump should be 42-45psi.
Turn off the key and the fuel pressure should drop a few psi and then drop very very slowly and down to zero overnight.
The fuel pressure for a 302 should be 31-34psi at idle depending on the vacuum at the FPR & 40-42psi at WOT.
It should also be 42 to 45psi if you pull the vacuum line off the FPR while the engine is idling.
/
To check the fuel system you need to hook up the fuel gauge, ground pin #6 of the self-test plug or short pin#2 to pin#6 and turn on the key.
The selected fuel pump should be 42-45psi.
Turn off the key and the fuel pressure should drop a few psi and then drop very very slowly and down to zero overnight.
The fuel pressure for a 302 should be 31-34psi at idle depending on the vacuum at the FPR & 40-42psi at WOT.
It should also be 42 to 45psi if you pull the vacuum line off the FPR while the engine is idling.
/
Thread Starter
|
New User
Joined: Jul 2011
Posts: 17
Likes: 0
The key being cycled will tell you nothing.
To check the fuel system you need to hook up the fuel gauge, ground pin #6 of the self-test plug or short pin#2 to pin#6 and turn on the key.
The selected fuel pump should be 42-45psi.
Turn off the key and the fuel pressure should drop a few psi and then drop very very slowly and down to zero overnight.
The fuel pressure for a 302 should be 31-34psi at idle depending on the vacuum at the FPR & 40-42psi at WOT.
It should also be 42 to 45psi if you pull the vacuum line off the FPR while the engine is idling.
/
To check the fuel system you need to hook up the fuel gauge, ground pin #6 of the self-test plug or short pin#2 to pin#6 and turn on the key.
The selected fuel pump should be 42-45psi.
Turn off the key and the fuel pressure should drop a few psi and then drop very very slowly and down to zero overnight.
The fuel pressure for a 302 should be 31-34psi at idle depending on the vacuum at the FPR & 40-42psi at WOT.
It should also be 42 to 45psi if you pull the vacuum line off the FPR while the engine is idling.
/
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
What did you change? which was the cause? if you're more clear you'll be helping others with similar problems.
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