I'm at a total loss.
First I should introduce my truck. Oh yeah, and I'm new here too. I have a 1988 chevy pickup. It's a regular cab, shortwheel base model. The TBI 4.3L is gone, and I have a 330 deluxe GM crate engine in it (350ci, 330 hp). It turns a Th400 and that goes to 3.43 gears. I retained the EFI pump, and I run a return style Mallory AFPR to regulate down to ~7 psi for my carb. The carb is a 4160 600cfm Holley.
Well, Saturday my fuel pump dies and leaves me stranded on the side of the road. I replaced it the following Monday, and my beauty fired right up! Took it for a ride Monday night, and it was running out of fuel by 4000 rpm in low. It's like my fuel bowl was sucked dry. I increased my fuel pressure slightly and the fuel starvation problem slightly improved.
With the old pump, I never had problems getting enough fuel to the engine. So, I assume it's the AutoZone "Master" pump. I brought it back and changed it out this morning for an AC Delco pump. Sad part- it continues to do the same problem. I put my old fuel filter back on, and the problem continues. So, the pump should be good and the filter too.
Perplexed, I wet the tires, and had a friend powerbrake my truck (in the grass) while I watched my fuel pressure gauge. It didn't budge, but again the engine ran out of fuel.
Now, going down the road you can nail it and it's wonderful... like before the pump died. Then, it falls on it's face at the end of first and you have to remove your foot from the accelerator before it will even idle. So, I can run the bowl dry, and it'll die. Then let off the pedal, and it comes back to life, but you better not touch the pedal or it'll suck it down again. If I were to wait 5 seconds and try to cruise at whatever speed it would be, the truck will severly surge, like it's sucking the front bowl dry and then using whatever fuel enteres the bowl. If I coast for 10/15 seconds, the bowl will refill, and I'm good to go, but it'll do it again if I accelerate hard.
It will also run out of fuel moderately accelerating to try and merge on the interstate.
How could this be? My new pump is doing fine-I think. Nothing like this was happening before the OE pump died. I can't say my supply line is too small b/c it was just right with the old pump.
Any Holley experts out there? Help me out please.
Thanks,
Ben T.
[ May 22, 2003: Message edited by: MuscleTruck ]
[ May 22, 2003: Message edited by: MuscleTruck ]</p>
First I should introduce my truck. Oh yeah, and I'm new here too. I have a 1988 chevy pickup. It's a regular cab, shortwheel base model. The TBI 4.3L is gone, and I have a 330 deluxe GM crate engine in it (350ci, 330 hp). It turns a Th400 and that goes to 3.43 gears. I retained the EFI pump, and I run a return style Mallory AFPR to regulate down to ~7 psi for my carb. The carb is a 4160 600cfm Holley.
Well, Saturday my fuel pump dies and leaves me stranded on the side of the road. I replaced it the following Monday, and my beauty fired right up! Took it for a ride Monday night, and it was running out of fuel by 4000 rpm in low. It's like my fuel bowl was sucked dry. I increased my fuel pressure slightly and the fuel starvation problem slightly improved.
With the old pump, I never had problems getting enough fuel to the engine. So, I assume it's the AutoZone "Master" pump. I brought it back and changed it out this morning for an AC Delco pump. Sad part- it continues to do the same problem. I put my old fuel filter back on, and the problem continues. So, the pump should be good and the filter too.
Perplexed, I wet the tires, and had a friend powerbrake my truck (in the grass) while I watched my fuel pressure gauge. It didn't budge, but again the engine ran out of fuel.
Now, going down the road you can nail it and it's wonderful... like before the pump died. Then, it falls on it's face at the end of first and you have to remove your foot from the accelerator before it will even idle. So, I can run the bowl dry, and it'll die. Then let off the pedal, and it comes back to life, but you better not touch the pedal or it'll suck it down again. If I were to wait 5 seconds and try to cruise at whatever speed it would be, the truck will severly surge, like it's sucking the front bowl dry and then using whatever fuel enteres the bowl. If I coast for 10/15 seconds, the bowl will refill, and I'm good to go, but it'll do it again if I accelerate hard.
It will also run out of fuel moderately accelerating to try and merge on the interstate.
How could this be? My new pump is doing fine-I think. Nothing like this was happening before the OE pump died. I can't say my supply line is too small b/c it was just right with the old pump.
Any Holley experts out there? Help me out please.
Thanks,
Ben T.
[ May 22, 2003: Message edited by: MuscleTruck ]
[ May 22, 2003: Message edited by: MuscleTruck ]</p>