You go to crank it and it cranks fine, but does not start?

Tiny
KEITH1970
  • MEMBER
  • 1996 CHEVROLET CAMARO
  • 5.7L
  • V8
  • RWD
  • MANUAL
  • 170,000 MILES
I have a 1996 z28 Camaro LT1, the car cranks fine every time you start it for a couple of days then there is two or three days you go to crank it and it cranks fine, but does not start. I have replaced the fuel relay, when it runs it has about 25 psi of fuel pressure, should it have more psi? When it will not start up it has no fuel pressure. What can it be that's cutting the fuel pump off or is it going out?
Tuesday, March 15th, 2016 AT 12:56 PM

10 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Minimum fuel pressure 41-47 psi key on only.
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Tuesday, March 15th, 2016 AT 4:33 PM
Tiny
KEITH1970
  • MEMBER
  • 6 POSTS
So I need to replace the fuel pump. Why does it work sometimes then it will not for a few days? The car was fine on Friday, Saturday, Sunday and Monday when I drove it to work then last night when I got off work around 2am it would not start it would crank fine, but no start.
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Wednesday, March 16th, 2016 AT 1:42 AM
Tiny
HMAC300
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What's the fuel pressure if it doesn't meet minimum it won't run right. It may build it up after a few days. I suggest having the car scanned for codes and check the fuel pressure.
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Wednesday, March 16th, 2016 AT 7:32 AM
Tiny
KEITH1970
  • MEMBER
  • 6 POSTS
I have put a code scanner on it and no codes. So can you tell me what I need to check? The fuel pressure is 25psi when the key is in the on position and it has 25psi even when it's running. When it's running the car runs really good.
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Wednesday, March 16th, 2016 AT 8:16 AM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
The fuel pump may or may not be the problem, had a firebird that did the same thing, the enthonal they use causes a build up and starts to clog the fuel screen on the end of the fuel pump, Take out the fuel pump and check the screen. When the car does not run for a couple of days the sediment settles, the car will run fine until the sediment starts to clog the screen up again.
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Wednesday, March 16th, 2016 AT 8:27 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You check a fuel pump with a gauge not a scanner on your car auto parts rent it. But what reitzel says may be true as well if you are running with 25 psi you are very lucky but if you going on eway it probably won't run worth a crap or going up a hill. Low fuel pressure wont' show any codes unless it's a 0171 code or 0174 code no codes doesn't mean that the pump still isn't good
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Wednesday, March 16th, 2016 AT 9:34 AM
Tiny
KEITH1970
  • MEMBER
  • 6 POSTS
I have checked the fuel pressure with a gauge that's how I know what the fuel pressure is. When the car cranks and run's you can hear something under the dash on the drivers side making a noise for a few seconds. But when it cranks but won't start you don't hear the sound under the dash. Does the BCM have anything to do with the fuel pump.
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Wednesday, March 16th, 2016 AT 9:46 AM
Tiny
HMAC300
  • MECHANIC
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No if you don't want to check what we've already given you then why keep asking? You have to do what we have said first the sound you are hearing is fuel pump relay working for 2 seconds which is normal. I have no further comments or suggestions
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Wednesday, March 16th, 2016 AT 9:54 AM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
HMAC300 is right, but there is something you posted I was thinking. You said you replaced the fuel pump relay? Where was the one you replaced? You say you can hear a clicking sound under the dash on the drivers side, that where the fuel pump relay is. Is that the one you replaced
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Thursday, March 17th, 2016 AT 1:16 PM
Tiny
KEITH1970
  • MEMBER
  • 6 POSTS
Yeah that's the one I replaced. It was the fuel pump that was bad. I took the fuel pump out when it wouldn't start up and hooked it up to the battery and it wouldn't come on so I dumped the side of it and it started working. So I put a new one in and the car has been running fine.
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Saturday, March 19th, 2016 AT 11:19 PM

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