The other picture

[Doug&Deb]

I have a 52 Coronet but the engine is from a 58 D-100. It has the correct ancillary equipment to work in a car. The problem I’m having is fuel starvation on hills. I’ve tried three different pumps and they all have the same problem. The one on there now always worked fine on the original engine. I should add that part of the problem is leakage from where the pump is screwed together. After looking up the pump for the truck I realized it’s completely different from the car application. I’m wondering if the cam is different and it’s trying to stroke the pump farther than it should. I’ll try to include pictures to show what I mean. I’ve ordered a truck pump to see if it works.

[JBNeal]

Maybe there is a problem with the fuel lines, possibly a pinched metal line or a collapsing rubber line...a reduced cross section on a draw tube will affect the pump's lift capacity, which can reduce its delivery rate to the point where it falls below the carburetor's operation threshold.

[Doug&Deb]

New line from tank to carb. Why is the truck pump different from the car application? The pivot lever is totally different. The pump on the car now worked fine on the original engine and it and two others I’ve tried have all had the same issue on this engine. The screws holding the pump together keep loosening quickly causing a leak and causing it to suck air which I’m sure is causing the starvation issue. I’ve ordered a truck specific pump to try. For now I’m removing the pump and running the electric pump just to keep the car roadworthy. 

[JBNeal]

Whenever I have run into screws that walk out, I apply one overlapping layer of Teflon tape to the threads...this has effectively wedged the screw in its mating threads without using thread-lock.  On small screws, this is easier said than done, but sharp tweezers, steady hands and a good eye can get it done.

[jpellican]

I think you are going to find that you will need to use the pump for the truck engine as the pump arms are different. 

[Young Ed]

58 minutes ago, jpellican said:

I think you are going to find that you will need to use the pump for the truck engine as the pump arms are different. 

The arms came in multiple styles but they interchange. The only part that makes it a truck pump is the outside design for body clearance 

[The Oil Soup]

You can also “clock” the lower part of the pump to accommodate a better fit.