Fuel Pump Installation: Holding pump in assembly? (with pic)

[91BlckGT]

A picture is worth a thousand words, so here:

Just a few quick questions:

1. See the orange cap? It's capped off the return line, and was like that when I pulled it from the car. It seems odd to wire a return line up from the engine to this, and have it be capped. Car ran normal for years like this, I'm just curious if anyone knows why?

2. I have a new pump, a walboro 190. The old pump is a Denco 190, but had a rubber grommet that went all around it. I had to cut the grommet to get it off, and it would appear it's required, as the fuel pump assembly, at least on my car, is not straight, but flares out. I'm concerned that the new rubber assembly isn't going to be held on as tight as the old, so I'd like to zip-tie it in place. Any concerns with that?

3. As you can see, the new pump came with a rubber isolator. That's basically the function of the full-size isolator I pulled off. I'm not sure I actually need to have them stacked up, and even if I did, the fuel filter sock might not mount properly. THoughts?

 

[Vinnietbird]

The orange cap isn't a "cap". It actually is split on the end and opens up. Leave it alone, it has a job to do.

Use the new insulator (it is a full insulator that fits around the pump, right?.....you need that), and if you can't get it to fit snug enough in the hanger, use a clamp (like for a radiator hose).

 

[jrichker]

The "orange cap" is actually a check valve of sorts. It prevents fuel from flowing back up the return line. I am not quite sure under what conditions that fuel would flow back up the return line, but there must be some chance of it happening. Saving the last cent of production costs is the goal of all auto makers, so if wasn't possible, they wouldn't have put it on there.

 

[NIKwoaC]

I did not have any sort of a rubber sock with my original pump or with my Walbro 255. I just installed the "Green Lantern" shaped rubber isolator and that was it.

 

[91BlckGT]

Well, I have the pump in and tank back up on the car. Will need to pick up some fuel today so I can check if i have fuel pressure again.

I ended up cutting the sock all the way around and using the rubber "green latern" isolator as well. The Denco pump has the inlet offset from the center like the Walbro do, so it wasn't just a straight swap.

In the end I didn't do a worm drive clamp around the pump, but that was a darn good idea. It seemed to stay put with just the rubber isolator holding it.