302 engine issues.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Maybe it's just me but you just contradicted yourself here. Fuel pumps don't have pressure ? Yet someone had 18.5 psi ? all that aside it takes very little flow to supply enough fuel to keep the bowls fed. Too much flow will cause too much pressure on a carbed engine. I'm using a 35 gal/hr electric to feed 3- two bbl Holleys on my 331. Even at WOT for a mile or two, they're fed enough fuel. Only time it fails is when the inline filter gets clogged, and that just serves to remind me it's time to change the filter.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
OK, then why are there low pressure and high pressure pumps ?
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I would look at the accelerator pump. It should squirt fuel the instant the throttle lever moves. It may not be doing this. You can check this with the engine off by looking at the squirters and moving the throttle lever on the carb. I would also check the vacuum diaphragm on the distributor to make sure it's working. Remove the cap and unplug the hose from the carb and watch to see if the breaker plate in the distributor moves when you suck on the hose.
Thread Starter
|
Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
I would look at the accelerator pump. It should squirt fuel the instant the throttle lever moves. It may not be doing this. You can check this with the engine off by looking at the squirters and moving the throttle lever on the carb. I would also check the vacuum diaphragm on the distributor to make sure it's working. Remove the cap and unplug the hose from the carb and watch to see if the breaker plate in the distributor moves when you suck on the hose.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
We're talking about a mild 302 build here. Which uses very little fuel. You can empty the fuel bowl by half and the flow going into the engine through the circuits will not change. His spark plugs don't indicate a rich condition. His fuel pump may not be supplying enough to keep the bowls filled here. Either that or there's something going on with the wiring to the distributor causing a short could be the source of the stumble.
Thread Starter
|
Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
We're talking about a mild 302 build here. Which uses very little fuel. You can empty the fuel bowl by half and the flow going into the engine through the circuits will not change. His spark plugs don't indicate a rich condition. His fuel pump may not be supplying enough to keep the bowls filled here. Either that or there's something going on with the wiring to the distributor causing a short could be the source of the stumble.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
We're talking about a mild 302 build here. Which uses very little fuel. You can empty the fuel bowl by half and the flow going into the engine through the circuits will not change. His spark plugs don't indicate a rich condition. His fuel pump may not be supplying enough to keep the bowls filled here. Either that or there's something going on with the wiring to the distributor causing a short could be the source of the stumble.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I'm not changing the subject. You went off in one direction, I'm trying to help him on another possibility.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Thanks again baddad457, I plan on getting my fuel pressure checked as soon as I can get the proper T fitting to hook my vacuum/fuel pressure gauge into my fuel line. I also want to increase my jet size from 62 to 64 to see if that will help with my hesitation issue, my carb is set up with size 62 jets,35 squirter nozzle,and a 9.5 power valve. I also will have my neighbor help me look over the electrical with his multi meter. Any more guidance on what all electrical checks we should do would be appreciated.
Thread Starter
|
Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
Check both the hot and negative going into the distributor. If you're running an aftermarket tach, check the green wire connected to the distributor negative, contrary to what you might think, if this wire touches ground, like in passing through the firewall, it will kill the power to the distributor. Learned that one the hard way many, many moons ago.
Thread Starter
|
Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
I tried to check my fuel pressure with my vacuum/fuel gauge today, it was going well until I noticed gas leaking where the vacuum hose connects to the bottom of the vacuum/fuel gauge so I quickly shut down the truck. Before I shut the truck down I noticed my fuel pressure was at 9 psi on high idle. I need to get a band clamp that fits better and maybe I should get fuel hose the same size as my vacuum hose to be on the safe side. Anybody with experience on checking fuel pressure want to give me some advice on how to properly and thoroughly check the fuel pressure. Thanks
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I tried to check my fuel pressure with my vacuum/fuel gauge today, it was going well until I noticed gas leaking where the vacuum hose connects to the bottom of the vacuum/fuel gauge so I quickly shut down the truck. Before I shut the truck down I noticed my fuel pressure was at 9 psi on high idle. I need to get a band clamp that fits better and maybe I should get fuel hose the same size as my vacuum hose to be on the safe side. Anybody with experience on checking fuel pressure want to give me some advice on how to properly and thoroughly check the fuel pressure. Thanks