Losing fuel pressure

[HankRearden]

I've been slowly piecing this dart together for a few years. Unfortunately about ten minutes at a time.
I tried to finally test drive it but it dies on hills.
Starves for fuel.
I assumed the fuel pump I used was damaged from sitting around and I changed it to a cheap clicky clack pump like I have used with success on other projects.
But I have the same problem.
The pump is mounted on the crossmember above the (new a couple years ago) sender.
I've had pumps suck this short distance without problems before.
I thought maybe the "sock" was clogged from the ethanol fuel and sitting around so I blew through with air. A lot.
In this video I unbolted the pump and let it hang below the fuel sender and it still loses pressure when I rev it.
I does the sane thing without the regulator but it just build 6.5 lbs sitting.
Any ideas?

 

[Dubob]

Have you tried with the fuel cap loosened? Building vacuum in the system maybe. Also the bourdon tube pressure gauge will show less pressure if it gets warm around the case unless there is a pressure equalization valve on it to compensate. Just my thoughts.

 

[HankRearden]

Have you tried with the fuel cap loosened? Building vacuum in the system maybe. Also the bourdon tube pressure gauge will show less pressure if it gets warm around the case unless there is a pressure equalization valve on it to compensate. Just my thoughts.

yep fuel cap was off. engine was fairly cold. no heat in the shop thermostat wasnt open yet.

 

[mbaird]

I had a Dart Sport that would start popping at end of track . Ran fine on the road … chased that issue for months . Then one day I was changing gears and saw I had kinked the fuel line close to the tank .

 

[RustyRatRod]

How are the rubber hose sections in the system? On my truck, the one from the sender to the supply line looked good on the outside but was very soft and was sucking closed on acceleration causing the same issue. Also, for what it's worth, when you blew air into the sender to unblock the sock, I can almost guarantee that you blew the sock off the end of the end of the sender inlet. Not that it'll really hurt anything.

 

[Oldmanmopar]

Take the sock off the sender the new senders the sock sucks up against the end of the tube. Cut the tube at an angle.

 

[HankRearden]

How are the rubber hose sections in the system? On my truck, the one from the sender to the supply line looked good on the outside but was very soft and was sucking closed on acceleration causing the same issue. Also, for what it's worth, when you blew air into the sender to unblock the sock, I can almost guarantee that you blew the sock off the end of the end of the sender inlet. Not that it'll really hurt anything.

I had one piece that seemed soft from the regulator to the carb. I replaced it. The rest is only about a month old.

 

[RustyRatRod]

I had one piece that seemed soft from the regulator to the carb. I replaced it. The rest is only about a month old.

Hopefully you replaced it with ethanol resistant. I go farther than that. I use the Gates Barricade rubber EFI hose. But be careful when you shop. There's also a Barricade hose for low PSI carbureted applications. It must have "EFI" printed on it. It's expensive and it requires some heavy duty clamps, but it works.

 

[HankRearden]

Hopefully you replaced it with ethanol resistant. I go farther than that. I use the Gates Barricade rubber EFI hose. But be careful when you shop. There's also a Barricade hose for low PSI carbureted applications. It must have "EFI" printed on it. It's expensive and it requires some heavy duty clamps, but it works.

I've used efi hose even on carbed applications since the late 90's. Partly because it's better and partly because we always had it on the shelf in the shops I worked in so it became habit. But I dont remember the brand but usually I get it from carquest. The soft stuff I pulled off was Goodyear. I have no idea where I bought it.
This car is the first time I ever used aluminum hard line. I figured I would give it a try but now I wonder about it.

 

[Bewy]

What pump is it?

 

[HankRearden]

What pump is it?

It had an inline high pressure pump for an 89 f150 made by airtex. I replaced it with a cheap piston style pump I don't think has a brand. I buy them two at a time and try to always keep one on hand for projects. I think this one is an E8413.

 

[MOPARMAGA]

I've been slowly piecing this dart together for a few years. Unfortunately about ten minutes at a time.
I tried to finally test drive it but it dies on hills.
Starves for fuel.
I assumed the fuel pump I used was damaged from sitting around and I changed it to a cheap clicky clack pump like I have used with success on other projects.
But I have the same problem.
The pump is mounted on the crossmember above the (new a couple years ago) sender.
I've had pumps suck this short distance without problems before.
I thought maybe the "sock" was clogged from the ethanol fuel and sitting around so I blew through with air. A lot.
In this video I unbolted the pump and let it hang below the fuel sender and it still loses pressure when I rev it.
I does the sane thing without the regulator but it just build 6.5 lbs sitting.
Any ideas?

Just watched the video, I don't think I've seen that before.