fuel pressure rapidly fluxuating
10-04-2011, 03:14 PM
#1
On The Tree
Thread Starter
Join Date: Oct 2009
Location: Northern VA
Posts: 106
Likes: 0
Received 0 Likes
on
0 Posts
fuel pressure rapidly fluxuating Hey got a 1998 transam t56 and lately it has been giving me a few problems.
I am relatively certain this is a fuel system issue. Sometimes it will fire up, run for about 30 seconds and then sometimes die and sometimes be fine. I'll get random "farts" where the engine will stumble in normal driving (this is rare, once every 2-3 weeks). Other times I can't get it to start at all. I"ll pop the hood and swap the fuel pressure relay with the a/c and sometimes that will work, sometimes it won't. I put my fuel pressure guage on it today, 1st time I primed I got 0 pressure and it wouldn't start (could have sworn i heard the fuel pump kick on though...). I reprimed and got 50. When it started the FPgauge needle would rapidly fluxuate between about 55-68, so fast that the need is just a blur. When I rev the engine from idle the FP steadies out. Any ideas? Fuel pump? some sort of pressure regulator? Something in the relay board? when this first started about a 6 months ago I just replaced the relay and it was fine until about 6 weeks ago. This isn't a daily driver and I was busy so i've put it off, but need to sort it out. This car has a mild TR cam and ls6 intake, otherwise stock. any help is appreciated!
I am relatively certain this is a fuel system issue. Sometimes it will fire up, run for about 30 seconds and then sometimes die and sometimes be fine. I'll get random "farts" where the engine will stumble in normal driving (this is rare, once every 2-3 weeks). Other times I can't get it to start at all. I"ll pop the hood and swap the fuel pressure relay with the a/c and sometimes that will work, sometimes it won't. I put my fuel pressure guage on it today, 1st time I primed I got 0 pressure and it wouldn't start (could have sworn i heard the fuel pump kick on though...). I reprimed and got 50. When it started the FPgauge needle would rapidly fluxuate between about 55-68, so fast that the need is just a blur. When I rev the engine from idle the FP steadies out. Any ideas? Fuel pump? some sort of pressure regulator? Something in the relay board? when this first started about a 6 months ago I just replaced the relay and it was fine until about 6 weeks ago. This isn't a daily driver and I was busy so i've put it off, but need to sort it out. This car has a mild TR cam and ls6 intake, otherwise stock. any help is appreciated!
