not enough fuel pressure going to mounted fuel pump on engine

[sonic]

who has any idea why im not getting enough fuel pressure to new mounted fuel pump on engine. i can tell who ever owned this before me took out the fuel filter and ran the line straight to fuel pump on engine . im getting a little fuel to the new pump but it does not run up line to carb. any body??????

 

[Rons beast]

I would first make sure the fuel line from the tank is not kinked, or clogged. The fuel sock in the tank may be clogged up. Is the fuel line the correct size for the engine? There could be a split in the line or in one of the rubber hoses by the tank and the pump cannot get full suction.

What exactly are you working on?

 

[Bully Bob]

Hi Sonic.,

What Ron said....,

Especially the last sentence..

I would add; What was the "old" pump doing...? If it was the same., then there's your clue.

Like Ron said., "somewhere between the fuel pick-up & the pump., there's a problem."

 

[miesk5]

yo,

Sonic wrote; "new mounted fuel pump on engine"

So, the pump isn't inside da tank as in EFI engined Broncos. He'll need to open the line and flush and air pressure test and clean / inspect tank

 

[Bully Bob]

I would add...,

My EB stumbled a while back... pulled the clear in-line filt. ...it was plugged with sticky rubber goo..!!

Put in a glass filt. & changed ALL the rubber lines.

I can only deduce it's the fuel these days... I cut open the (removed) lines & the inside was rotting away..!!!!!!

JUST A "HEADS-UP"

 

[BroncoJoe19]

When I was a kid, I had a 64 Rambler american with a flat head six. I think the top end on it was 80 mph, and it only took a day or two to get there

At any rate, one day I noted that I couldn't get over 55 with it, but it ran fine at lower speeds. The problem ended up being, (as mentioned above) a dry rotted rubber hose between the tank and the metal fuel line. The engine mounted fuel pump was pulling air through the hose instead of fuel.

You mentioned that you don't have pressure to the pump. The only pressure to the pump would be regulated by the amount of fuel you have in the tank. More fuel... more pressure. There is no in-tank pump, as miesk5 mentioned.

 

[Seabronc]

It would be nice to know what year truck and engine we are talking about. Even though there is a clue that it is some where between 0 and 1987, it would be neat so we could be more accurate with responses. Please put your truck vital statistics in your signature.

Good luck,